SOLANKI, Gaurav. Tramadol as an Analgesic to Treat Chronic Pain. International Journal of Pharmacological Research, [S. l.], v. 2, n. 4, p. 120–126, 2013. DOI: 10.7439/ijpr.v2i4.513. Disponível em: https://ssjournals.co.in/index.php/ijpr/article/view/1225. Acesso em: 12 mar. 2026.