Karya, Urmila, Sweta Kumari, Anupam Rani, and Shakun Singh. “Clinical Significance of Unexplained Elevated Maternal Serum Alpha Feto-Protein in Second Trimester of Pregnancy”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology 7, no. 6 (May 26, 2018): 2245–2250. Accessed October 14, 2025. https://www.ijrcog.org/index.php/ijrcog/article/view/4714.