K. N. M., A.R. 2017. Effect of intramuscular tramadol hydrochloride as a labor analgesic in primagravidae. International Journal of Reproduction, Contraception, Obstetrics and Gynecology. 5, 3 (Feb. 2017), 615–619. DOI:https://doi.org/10.18203/2320-1770.ijrcog20160460.