Kumari, K., Swaroop, N., Sharma, P., Seth, S., Kanti, V. and Kumar, D. 2017. Intravenous infusion of tramadol - a safe labour analgesia. International Journal of Reproduction, Contraception, Obstetrics and Gynecology. 4, 4 (Feb. 2017), 1044–1047. DOI:https://doi.org/10.18203/2320-1770.ijrcog20150423.