Nosenko, O. M., and K. Bakary. “The Role of Undifferentiated Connective Tissue Diseases in the Development of Ischemic-Cervical Insufficiency in Pregnant Women”. Journal of Education, Health and Sport, vol. 8, no. 7, July 2018, pp. 471-8, https://apcz.umk.pl/JEHS/article/view/5786.