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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">koz</journal-id><journal-title-group><journal-title xml:lang="ru">"Вестник Северо-Казахстанского университета имени Манаша Козыбаева"</journal-title><trans-title-group xml:lang="en"><trans-title>Bulletin of Manash Kozybayev North Kazakhstan University</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2958-003X</issn><issn pub-type="epub">2958-0048</issn><publisher><publisher-name>М. Қозыбаев атындағы СҚУ</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.54596/2958-0048-2025-4-114-122</article-id><article-id custom-type="elpub" pub-id-type="custom">koz-2306</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>СОЦИАЛЬНО-ГУМАНИТАРНЫЕ НАУКИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>SOCIAL AND HUMAN SCIENCES</subject></subj-group></article-categories><title-group><article-title>Фриланс как объект научного изучения: обзор литературы</article-title><trans-title-group xml:lang="en"><trans-title>Freelancing as an object of scientific study: a literature review</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Абдреисова</surname><given-names>Д. Ж.</given-names></name><name name-style="western" xml:lang="en"><surname>Abdreissova</surname><given-names>D. Zh.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Абдреисова Диана Жакслыковна - докторант, кафедра "Экономика, учёт и финансы", ФИЭП.</p><p>Петропавловск</p></bio><bio xml:lang="en"><p>Diana Zh. Abdreissova – corresponding author, methodologist of the scientific and methodological department of the Manash Kozybayev North Kazakhstan University.</p><p>Petropavlovsk</p></bio><email xlink:type="simple">diana_gmu05@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">НАО «Северо-Казахстанский университет имени Манаша Козыбаева»<country>Казахстан</country></aff><aff xml:lang="en">Manash Kozybayev North Kazakhstan University NPLC<country>Kazakhstan</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>12</day><month>01</month><year>2026</year></pub-date><volume>0</volume><issue>4 (68)</issue><fpage>114</fpage><lpage>122</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Абдреисова Д.Ж., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Абдреисова Д.Ж.</copyright-holder><copyright-holder xml:lang="en">Abdreissova D.Z.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://vestnik.ku.edu.kz/jour/article/view/2306">https://vestnik.ku.edu.kz/jour/article/view/2306</self-uri><abstract><p>Фриланс в современном обществе выступает одной из ключевых форм нетипичной занятости, обусловленной цифровизацией экономики и распространением онлайн-платформ. Под этим феноменом понимается выполнение трудовой деятельности на проектной или временной основе без заключения традиционного трудового договора. Его развитие связано с глобальными изменениями в организации труда, ростом «гиг-экономики» и изменением профессиональной идентичности работников.</p><p>В мировой литературе сформировался широкий спектр подходов к анализу фриланса. Экономические и социологические исследования рассматривают его как проявление гибкой занятости, акцентируя внимание на доходах, статусе и мотивации фрилансеров. Правовые публикации затрагивают вопросы социальной защиты и налогообложения. Цифровизация рынка труда поставила новые исследовательские задачи, связанные с функционированием платформ и глобализацией трудовых процессов.</p><p>Казахстанский контекст пока остаётся недостаточно изученным. В официальной статистике фриланс чаще включается в категорию самозанятых, что затрудняет оценку его масштабов. Вместе с тем наблюдается рост числа специалистов, работающих через цифровые платформы в сферах ИТ, дизайна и маркетинга.</p><p>Цель статьи систематизировать существующие исследования о фрилансе, выявить основные направления анализа и определить пробелы в изучении данного феномена в Казахстане.</p></abstract><trans-abstract xml:lang="en"><p>Freelancing in modern society is one of the key forms of atypical employment caused by the digitalization of the economy and the spread of online platforms. This phenomenon refers to the performance of work on a project or temporary basis without entering into a traditional employment contract. Its development is associated with global changes in the organization of work, the growth of the "gig economy" and a change in the professional identity of workers.</p><p>A wide range of approaches to freelance analysis has emerged in the world literature. Economic and sociological studies consider it as a manifestation of flexible employment, focusing on income, status and motivation of freelancers. Legal publications address issues of social protection and taxation. The digitalization of the labor market has set new research objectives related to the functioning of platforms and the globalization of labor processes.</p><p>The Kazakh context remains insufficiently studied. In official statistics, freelancing is more often included in the category of self-employed, which makes it difficult to assess its scale. At the same time, there is an increase in the number of specialists working through digital platforms in the fields of IT, design and marketing.</p><p>The purpose of the article is to systematize existing research on freelancing, identify the main areas of analysis and identify gaps in the study of this phenomenon in Kazakhstan.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>фриланс</kwd><kwd>цифровая занятость</kwd><kwd>нетипичная занятость</kwd><kwd>рынок труда</kwd><kwd>интеллектуальный труд</kwd><kwd>Интернет</kwd></kwd-group><kwd-group xml:lang="en"><kwd>freelancing</kwd><kwd>digital employment</kwd><kwd>atypical employment</kwd><kwd>labor market</kwd><kwd>intellectual labor</kwd><kwd>Internet</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Stanworth, C., &amp; Stanworth, J. (1995). Self-employment and the small firm. In J. Atkinson &amp; D. Storey (Eds.), Employment, the Small Firm and the Labour Market (pp. 199–210). London: Routledge.</mixed-citation><mixed-citation xml:lang="en">Stanworth, C., &amp; Stanworth, J. (1995). Self-employment and the small firm. In J. Atkinson &amp; D. Storey (Eds.), Employment, the Small Firm and the Labour Market (pp. 199–210). London: Routledge.</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">International Labour Organization (ILO). (2015). Non-standard forms of employment: Report for discussion at the Meeting of Experts on Non-Standard Forms of Employment. Geneva: International Labour Office.</mixed-citation><mixed-citation xml:lang="en">International Labour Organization (ILO). (2015). Non-standard forms of employment: Report for discussion at the Meeting of Experts on Non-Standard Forms of Employment. Geneva: International Labour Office.</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">OECD. (2019). OECD Employment Outlook 2019: The Future of Work. Paris: OECD Publishing. https://doi.org/10.1787/9ee00155-en</mixed-citation><mixed-citation xml:lang="en">OECD. (2019). OECD Employment Outlook 2019: The Future of Work. Paris: OECD Publishing. https://doi.org/10.1787/9ee00155-en</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Kalleberg, A.L., &amp; Dunn, M. (2016). Good jobs, bad jobs in the gig economy. Perspectives on Work, 20(1), 10–14.</mixed-citation><mixed-citation xml:lang="en">Kalleberg, A.L., &amp; Dunn, M. (2016). Good jobs, bad jobs in the gig economy. Perspectives on Work, 20(1), 10–14.</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">Barley, S.R., Bechky, B.A., &amp; Milliken, F.J. (2017). The changing nature of work: Careers, identities, and work lives in the 21st century. Academy of Management Discoveries, 3(2), 111–115. https://doi.org/10.5465/amd.2017.0034</mixed-citation><mixed-citation xml:lang="en">Barley, S.R., Bechky, B.A., &amp; Milliken, F.J. (2017). The changing nature of work: Careers, identities, and work lives in the 21st century. Academy of Management Discoveries, 3(2), 111–115. https://doi.org/10.5465/amd.2017.0034</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Kitching, J., &amp; Smallbone, D. (2012). Are freelancers a neglected form of small business? Journal of Small Business and Enterprise Development, 19(1), 74 – 91. https://doi.org/10.1108/14626001211196415</mixed-citation><mixed-citation xml:lang="en">Kitching, J., &amp; Smallbone, D. (2012). Are freelancers a neglected form of small business? Journal of Small Business and Enterprise Development, 19(1), 74 – 91. https://doi.org/10.1108/14626001211196415</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Prassl, J. (2018). Humans as a service: The promise and perils of work in the gig economy. Oxford University Press.</mixed-citation><mixed-citation xml:lang="en">Prassl, J. (2018). Humans as a service: The promise and perils of work in the gig economy. Oxford University Press.</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Wood, A.J., Graham, M., Lehdonvirta, V., &amp; Hjorth, I. (2019). Good gig, bad gig: Autonomy and algorithmic control in the global gig economy. Work, Employment and Society, 33(1), 56–75.</mixed-citation><mixed-citation xml:lang="en">Wood, A.J., Graham, M., Lehdonvirta, V., &amp; Hjorth, I. (2019). Good gig, bad gig: Autonomy and algorithmic control in the global gig economy. Work, Employment and Society, 33(1), 56–75.</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">De Stefano, V. (2016). The rise of the “just-in-time workforce”: On-demand work, crowdwork, and labor protection in the “gig-economy”. Comparative Labor Law &amp; Policy Journal, 37(3), 471–503.</mixed-citation><mixed-citation xml:lang="en">De Stefano, V. (2016). The rise of the “just-in-time workforce”: On-demand work, crowdwork, and labor protection in the “gig-economy”. Comparative Labor Law &amp; Policy Journal, 37(3), 471–503.</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Bureau of National Statistics of the Republic of Kazakhstan. Labour market indicators. Astana: BNS RK.</mixed-citation><mixed-citation xml:lang="en">Bureau of National Statistics of the Republic of Kazakhstan. Labour market indicators. Astana: BNS RK.</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Zhanabayeva, A.B. (2020). Freelancing as a new form of youth employment in Kazakhstan. Bulletin of KazNU. Sociological Series, 1(82), 112–120.</mixed-citation><mixed-citation xml:lang="en">Zhanabayeva, A.B. (2020). Freelancing as a new form of youth employment in Kazakhstan. Bulletin of KazNU. Sociological Series, 1(82), 112–120.</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Sadykova, G.M. (2021). Digital economy and freelancing: Challenges and prospects in Kazakhstan. Economics and Statistics, 2(24), 45–53.</mixed-citation><mixed-citation xml:lang="en">Sadykova, G.M. (2021). Digital economy and freelancing: Challenges and prospects in Kazakhstan. Economics and Statistics, 2(24), 45–53.</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Kitchenham, B. (2004). Procedures for performing systematic reviews. Keele University Technical Report TR/SE-0401.</mixed-citation><mixed-citation xml:lang="en">Kitchenham, B. (2004). Procedures for performing systematic reviews. Keele University Technical Report TR/SE-0401.</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">Snyder, H. (2019). Literature review as a research methodology: An overview and guidelines. Journal of Business Research, 104, 333–339. https://doi.org/10.1016/j.jbusres.2019.07.039</mixed-citation><mixed-citation xml:lang="en">Snyder, H. (2019). Literature review as a research methodology: An overview and guidelines. Journal of Business Research, 104, 333–339. https://doi.org/10.1016/j.jbusres.2019.07.039</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Pesole, A., Urzí Brancati, M.C., Fernández-Macías, E., Biagi, F., &amp; González Vázquez, I. (2018). Platform workers in Europe: Evidence from the COLLEEM Survey. Luxembourg: Publications Office of the European Union. https://doi.org/10.2760/742789</mixed-citation><mixed-citation xml:lang="en">Pesole, A., Urzí Brancati, M.C., Fernández-Macías, E., Biagi, F., &amp; González Vázquez, I. (2018). Platform workers in Europe: Evidence from the COLLEEM Survey. Luxembourg: Publications Office of the European Union. https://doi.org/10.2760/742789</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Kalleberg, A.L. (2009). Precarious work, insecure workers: Employment relations in transition. American Sociological Review, 74(1), 1–22. https://doi.org/10.1177/000312240907400101</mixed-citation><mixed-citation xml:lang="en">Kalleberg, A.L. (2009). Precarious work, insecure workers: Employment relations in transition. American Sociological Review, 74(1), 1–22. https://doi.org/10.1177/000312240907400101</mixed-citation></citation-alternatives></ref><ref id="cit17"><label>17</label><citation-alternatives><mixed-citation xml:lang="ru">OECD/ILO. (2019). Measuring platform work. Joint OECD–ILO report. Geneva/Paris.</mixed-citation><mixed-citation xml:lang="en">OECD/ILO. (2019). Measuring platform work. Joint OECD–ILO report. Geneva/Paris.</mixed-citation></citation-alternatives></ref><ref id="cit18"><label>18</label><citation-alternatives><mixed-citation xml:lang="ru">Tubaro, P., Casilli, A.A., &amp; Coville, M. (2020). The trainer, the verifier, the imitator: Three ways in which human platform workers support artificial intelligence. Oxford: Oxford Internet Institute, University of Oxford.</mixed-citation><mixed-citation xml:lang="en">Tubaro, P., Casilli, A.A., &amp; Coville, M. (2020). The trainer, the verifier, the imitator: Three ways in which human platform workers support artificial intelligence. Oxford: Oxford Internet Institute, University of Oxford.</mixed-citation></citation-alternatives></ref><ref id="cit19"><label>19</label><citation-alternatives><mixed-citation xml:lang="ru">OECD. (2019). OECD Employment Outlook 2019: The Future of Work. Paris: OECD Publishing. https://doi.org/10.1787/9ee00155-en</mixed-citation><mixed-citation xml:lang="en">OECD. (2019). OECD Employment Outlook 2019: The Future of Work. Paris: OECD Publishing. https://doi.org/10.1787/9ee00155-en</mixed-citation></citation-alternatives></ref><ref id="cit20"><label>20</label><citation-alternatives><mixed-citation xml:lang="ru">Rahmetulina, Z. (2023). Freelancing in Kazakhstan: Trends, opportunities and challenges. Central Asian Journal of Social Sciences and Humanities, 9(2), 55–64.</mixed-citation><mixed-citation xml:lang="en">Rahmetulina, Z. (2023). Freelancing in Kazakhstan: Trends, opportunities and challenges. Central Asian Journal of Social Sciences and Humanities, 9(2), 55–64.</mixed-citation></citation-alternatives></ref><ref id="cit21"><label>21</label><citation-alternatives><mixed-citation xml:lang="ru">Abdreissova, D.Zh., Baitenizov, D.T., Azatbek, T.A., &amp; Valieva, S.N. (2021). Freelance market development factors. Bulletin of the Karaganda University. Economy Series, 103(3), 45–55.</mixed-citation><mixed-citation xml:lang="en">Abdreissova, D.Zh., Baitenizov, D.T., Azatbek, T.A., &amp; Valieva, S.N. (2021). Freelance market development factors. Bulletin of the Karaganda University. Economy Series, 103(3), 45–55.</mixed-citation></citation-alternatives></ref><ref id="cit22"><label>22</label><citation-alternatives><mixed-citation xml:lang="ru">Abdreissova, D.Zh., Baitenizov, D.T., &amp; Azatbek, T.A. (2023). Freelancing as an opportunity for the development of IT services export. Bulletin of L.N. Gumilyov Eurasian National University. Economics Series, 2(23), 26–38. https://doi.org/10.32523/2789-4320-2023-2-26-38</mixed-citation><mixed-citation xml:lang="en">Abdreissova, D.Zh., Baitenizov, D.T., &amp; Azatbek, T.A. (2023). Freelancing as an opportunity for the development of IT services export. Bulletin of L.N. Gumilyov Eurasian National University. Economics Series, 2(23), 26–38. https://doi.org/10.32523/2789-4320-2023-2-26-38</mixed-citation></citation-alternatives></ref><ref id="cit23"><label>23</label><citation-alternatives><mixed-citation xml:lang="ru">European Training Foundation. (2024). New forms of work and platform work in Central Asia: Regional report. Luxembourg: Publications Office of the European Union.</mixed-citation><mixed-citation xml:lang="en">European Training Foundation. (2024). New forms of work and platform work in Central Asia: Regional report. Luxembourg: Publications Office of the European Union.</mixed-citation></citation-alternatives></ref><ref id="cit24"><label>24</label><citation-alternatives><mixed-citation xml:lang="ru">Abdreisova, D.Zh., Baytenizov, D.T., Azatbek, T.A., &amp; Valieva, S.N. (2021). Factors of freelance market development. Economy: Strategy and Practice, 16(4), 188–207. https://doi.org/10.51176/1997-9967-2021-4-188-207</mixed-citation><mixed-citation xml:lang="en">Abdreisova, D.Zh., Baytenizov, D.T., Azatbek, T.A., &amp; Valieva, S.N. (2021). Factors of freelance market development. Economy: Strategy and Practice, 16(4), 188–207. https://doi.org/10.51176/1997-9967-2021-4-188-207</mixed-citation></citation-alternatives></ref><ref id="cit25"><label>25</label><citation-alternatives><mixed-citation xml:lang="ru">Freelancehunt. (2019). All-Ukrainian census of freelancers. Retrieved from https://freelancehunt.com</mixed-citation><mixed-citation xml:lang="en">Freelancehunt. (2019). All-Ukrainian census of freelancers. Retrieved from https://freelancehunt.com</mixed-citation></citation-alternatives></ref><ref id="cit26"><label>26</label><citation-alternatives><mixed-citation xml:lang="ru">FL.ru. (2018). Analytical report on the freelance market in Russia. Retrieved from https://fl.ru</mixed-citation><mixed-citation xml:lang="en">FL.ru. (2018). Analytical report on the freelance market in Russia. Retrieved from https://fl.ru</mixed-citation></citation-alternatives></ref><ref id="cit27"><label>27</label><citation-alternatives><mixed-citation xml:lang="ru">Strebkov, D.O., &amp; Shevchuk, A.V. (2010). Freelancers in the labor market: Employment features and socio-demographic profile. Sociological Studies, 6, 45–55.</mixed-citation><mixed-citation xml:lang="en">Strebkov, D.O., &amp; Shevchuk, A.V. (2010). Freelancers in the labor market: Employment features and socio-demographic profile. Sociological Studies, 6, 45–55.</mixed-citation></citation-alternatives></ref><ref id="cit28"><label>28</label><citation-alternatives><mixed-citation xml:lang="ru">Golova, I.M., &amp; Bayetova, D. (2019). Self-employment and freelancing in the modern economy: Legal and organizational aspects. Journal of Russian Law, 4, 65–73.</mixed-citation><mixed-citation xml:lang="en">Golova, I.M., &amp; Bayetova, D. (2019). Self-employment and freelancing in the modern economy: Legal and organizational aspects. Journal of Russian Law, 4, 65–73.</mixed-citation></citation-alternatives></ref><ref id="cit29"><label>29</label><citation-alternatives><mixed-citation xml:lang="ru">Abdreisova, D.Zh., &amp; Baytenizov, D.T. (2024). Portrait of the freelance market in the new economy of Kazakhstan. Statistics, Accounting and Audit, 3(94), 82–100. https://doi.org/10.51579/1563-2415.2024.-3.07</mixed-citation><mixed-citation xml:lang="en">Abdreisova, D.Zh., &amp; Baytenizov, D.T. (2024). Portrait of the freelance market in the new economy of Kazakhstan. Statistics, Accounting and Audit, 3(94), 82–100. https://doi.org/10.51579/1563-2415.2024.-3.07</mixed-citation></citation-alternatives></ref><ref id="cit30"><label>30</label><citation-alternatives><mixed-citation xml:lang="ru">Berg, J., Furrer, M., Harmon, E., Rani, U., &amp; Silberman, M.S. (2018). Digital labour platforms and the future of work: Towards decent work in the online world. Geneva: International Labour Organization. ISBN Print: 978-92-2-031024-3; Web PDF: 978-92-2-031025-0.</mixed-citation><mixed-citation xml:lang="en">Berg, J., Furrer, M., Harmon, E., Rani, U., &amp; Silberman, M.S. (2018). Digital labour platforms and the future of work: Towards decent work in the online world. Geneva: International Labour Organization. ISBN Print: 978-92-2-031024-3; Web PDF: 978-92-2-031025-0.</mixed-citation></citation-alternatives></ref><ref id="cit31"><label>31</label><citation-alternatives><mixed-citation xml:lang="ru">Oxford Internet Institute. (2023, July 20). Gig Workers Behind AI Face ‘Unfair Working Conditions,’ Oxford Report Finds. Retrieved from https://time.com/6296196/ai-data-gig-workers/</mixed-citation><mixed-citation xml:lang="en">Oxford Internet Institute. (2023, July 20). Gig Workers Behind AI Face ‘Unfair Working Conditions,’ Oxford Report Finds. Retrieved from https://time.com/6296196/ai-data-gig-workers/</mixed-citation></citation-alternatives></ref><ref id="cit32"><label>32</label><citation-alternatives><mixed-citation xml:lang="ru">Strebkov, D.O., &amp; Shevchuk, A.V. (2010). Freelancers in the Russian labor market. Sociological Studies, (1), 45–55.</mixed-citation><mixed-citation xml:lang="en">Strebkov, D.O., &amp; Shevchuk, A.V. (2010). Freelancers in the Russian labor market. Sociological Studies, (1), 45–55.</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
