SINGH, P.; HUSSAIN, A.; B, R.; MISHAL, M.; JINGAR, H. A Comparative Study of Efficacy of Analgesiaand Anaesthesia between Intrathecal ButorphanolAndFentanyl with Bupivacaine 0.5% Heavy for Lower Limb Orthopedic Surgery: A Prospective Randomized Study. International Journal of Health and Clinical Research, [S. l.], v. 4, n. 3, p. 56–60, 2021. Disponível em: https://ijhcr.com/index.php/ijhcr/article/view/871. Acesso em: 3 jul. 2024.