Viswanadh, P., S. Subramanian, and H. Bal. “An Observational Study of Parenteral Paracetamol Vis a Vis Tramadol As Labour Analgesics”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 10, no. 2, Jan. 2021, pp. 677-82, doi:10.18203/2320-1770.ijrcog20210326.