Pakharenko, L. V., and O. M. Perkhulyn. 2021. “Assessment of the Hormonal Levels in Different Management Strategies for Women With Cervical Insufficiency and a History of Anovulatory Infertility”. Zaporozhye мedical Journal 23 (1):98-104. https://doi.org/10.14739/2310-1210.2021.1.224898.