Yunakova, Maria, Sergei Slavov, Constantsa Neykova, Atanas Shterev, and Ivan Kostov. “Role of Age As a Major Determinant of Assisted Reproductive Technologies Outcome”. Proceedings of the Bulgarian Academy of Sciences 77, no. 5 (May 25, 2024): 753–759. Accessed February 15, 2025. https://www.proceedings.bas.bg/index.php/cr/article/view/544.