GUPTA, A.; TIWARI, T.; KAPOOR, R.; MALIK, A.; ABBAS, H.; SINGH, P. R. Comparative study of ropivacaine with ropivacaine-fentanyl and ropivacaine-fentanyl- magnesium sulfate in epidural anesthesia for lower limb surgeries. International Surgery Journal, [S. l.], v. 5, n. 4, p. 1300–1305, 2018. DOI: 10.18203/2349-2902.isj20181010. Disponível em: https://www.ijsurgery.com/index.php/isj/article/view/2768. Acesso em: 26 nov. 2025.