Fentanyl and Clonidine with local Anaesthetics in Supraclavicular Brachial Plexus Block for Post operative Analgesia : A Comparative study. Asian Journal of Pharmaceutical and Health Sciences, [S. l.], v. 6, n. 3, p. 1514–1521, 2016. Disponível em: https://ajphs.com/index.php/ajphs/article/view/387. Acesso em: 31 jan. 2026.