Reddy, B. Srinivasulu, and G. Pratapa Reddy. “Efficacy of Ketamine Hcl and Tramadol Hcl by Epidural Route for Lower Abdominal Surgeries”. International Journal of Advances in Medicine 6, no. 4 (July 24, 2019): 1188–1192. Accessed December 24, 2025. https://www.ijmedicine.com/index.php/ijam/article/view/1735.