SAILO, S.; ZODINPUIA, M.; P., N. Study of morphine with ropivacaine and ropivacaine alone for caudal epidural analgesia in children. International Surgery Journal, [S. l.], v. 7, n. 3, p. 781–786, 2020. DOI: 10.18203/2349-2902.isj20200822. Disponível em: https://www.ijsurgery.com/index.php/isj/article/view/5718. Acesso em: 27 feb. 2026.