Valkova , Lyuboslava, Petya Andreeva, Tanya Milachich, Boryana Bandreva, Petya Penkova, Ivan Bochev, Boryana Petkova, Tanya Timeva, and Atanas Shterev. “Determination of Optimal Number of Vitrified Human Autologous or Donor Oocytes Needed for One Live Birth”. Problems of Cryobiology and Cryomedicine 30, no. 4 (December 14, 2020): 384–388. Accessed March 29, 2024. http://cryo.org.ua/journal/index.php/probl-cryobiol-cryomed/article/view/1695.