SHANKAR, Shilpa; CHAKOLE, Vivek; SINGAM, Amol. A Comparative Study of Ropivacaine Alone, Ropivacaine With Tramadol And Ropivacaine With Fentanyl For Caudal Analgesia In Paediatric Infraumbilical Surgery. International Journal of Psychosocial Rehabilitation, [S. l.], v. 24, n. 8, p. 4109–4117, 2020. DOI: 10.61841/jycts880. Disponível em: https://www.psychosocial.com/index.php/ijpr/article/view/11034. Acesso em: 11 may. 2026.