A comparison of the analgesic effect of intravenous nalbuphine and tramadol in patients with post-operative pain - a double blind prospective randomised study. Asian Journal of Pharmaceutical and Health Sciences, [S. l.], v. 3, n. 3, p. 786–790, 2013. Disponível em: https://ajphs.com/index.php/ajphs/article/view/564. Acesso em: 13 mar. 2026.