Gaydarova, Lora, Elena Hristova, and Plamen Todorov. “Vitrification of Male Gametes — Our Experience”. Problems of Cryobiology and Cryomedicine 35, no. 4 (December 30, 2025): 233. Accessed April 11, 2026. https://cryo.org.ua/journal/index.php/probl-cryobiol-cryomed/article/view/2121.