R. S. Anand, P. Singh, R. Sangal, R. Srivastava, N. R. Sharma, and H. C. Tiwari, “Amniotic fluid index, non-stress test and color of liquor: as a predictor of perinatal outcome”, Int J Reprod Contracept Obstet Gynecol, vol. 5, no. 10, pp. 3512–3517, Dec. 2016.