Sharmin, S.; Khanam, S.; Saha, S. C.; Naher, F. K.; Jahan, M.; Shukla, J.; Chowdhury, A. H.; Ashafuddoula, A. Intramuscular Pethidine for Pain Relief in the First Stage of Labor. Ibrahim card. med. j. 2019, 7, 99-106.