Comparative Study of Ropivacaine 0.5% with fentanyl and Bupivacaine 0.5% with fentanyl in Interscalene Brachial Plexus Block. International Journal of Biomedical and Advance Research, [S. l.], v. 7, n. 11, p. 543–546, 2016. DOI: 10.7439/ijbar.v7i11.3747. Disponível em: https://ssjournals.co.in/index.php/ijbar/article/view/3747. Acesso em: 17 feb. 2026.