Onyiriuka, Alphonsus N. “Twin Birth Order, Birthweight and Birthweight Discordance: Any Relationship?”. Nepal Journal of Obstetrics and Gynaecology 6, no. 1 (August 17, 2011): 46–50. Accessed May 8, 2024. https://www.nepjol.info/index.php/NJOG/article/view/5252.