REDDY, B. S.; REDDY, G. P. Efficacy of Ketamine Hcl and Tramadol Hcl by epidural route for lower abdominal surgeries. International Journal of Advances in Medicine, [S. l.], v. 6, n. 4, p. 1188–1192, 2019. DOI: 10.18203/2349-3933.ijam20193269. Disponível em: https://www.ijmedicine.com/index.php/ijam/article/view/1735. Acesso em: 25 dec. 2025.