A comparison of the postoperative analgesic efficacy of three in one block with intravenous injection tramadol. International Journal of Biomedical and Advance Research, [S. l.], v. 8, n. 1, p. 19–23, 2017. DOI: 10.7439/ijbar.v8i1.3927. Disponível em: https://ssjournals.co.in/index.php/ijbar/article/view/3927. Acesso em: 20 apr. 2026.