Fating, Dnyaneshwar R., and N. G. Tirpude. 2017. “Comparative Study Between Injection Parecoxib and Butorphanol for Postoperative Analgesia in Laparotomy Patients”. International Journal of Research in Medical Sciences 5 (3):773-77. https://doi.org/10.18203/2320-6012.ijrms20170431.