GOSWAMI, T. K.; GHOSHAL, P. K.; HAZRA, A.; BISWAS, A. Efficacy and safety of a centrally acting analgesic flupirtine in primary knee osteoarthritis in comparison to tramadol: a randomized controlled trial. International Journal of Basic & Clinical Pharmacology, [S. l.], v. 7, n. 3, p. 381–385, 2018. DOI: 10.18203/2319-2003.ijbcp20180484. Disponível em: https://www.ijbcp.com/index.php/ijbcp/article/view/2365. Acesso em: 23 oct. 2025.