RAVI M.; NARAYANAN N. Formulation and in vitro evaluation of gastro retentive drug delivery system of tramadol hydrochloride. International Journal of Research in Pharmaceutical Sciences, [S. l.], v. 3, n. 4, p. 503–508, 2012. Disponível em: https://ijrps.com/home/article/view/3436. Acesso em: 21 nov. 2024.