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 (Dec. 2016), 35–39. DOI:https://doi.org/10.3329/jafmc.v12i2.41084.