Merck Medicus: A basket of free resources. Portuguese Journal of Family Medicine and General Practice, [S. l.], v. 23, n. 7, p. 39, 2007. DOI: 10.32385/rpmgf.v23i7.10452. Disponível em: https://rpmgf.pt/ojs/index.php/rpmgf/article/view/10452. Acesso em: 18 apr. 2026.