Bongso, A., C. Y. Fong, S. C. Ng, and S. S. Ratnam. “Embryo Coculture: Sequential Transfer and Blastocyst Freezing”. Medical Journal of Indonesia 5, no. 1 (January 1, 1996): 28-32. Accessed May 3, 2024. http://mji.ui.ac.id/journal/index.php/mji/article/view/842.