UPADHYAY, DK; PALAIAN, S; KISHORE, PV; PAUDEL, R; PRABHU, M; SHANKAR, PR; MISHRA, P. Tramadol. Journal of Institute of Medicine Nepal, [S. l.], v. 28, n. 3, p. 57–61, 2007. Disponível em: https://nepjol.info/index.php/JIOM/article/view/633. Acesso em: 31 jan. 2025.