Maruf, A. A., Ershad, R. and Nazrina, S. (2016) “Preemptive Use of Low Dose Intravenous Ketamine on Post Operative Pain after Laparoscopic Cholecystectomy”, Journal of Armed Forces Medical College, Bangladesh, 12(2), pp. 35–39. doi: 10.3329/jafmc.v12i2.41084.