Le DinhT., and Nguyen DucL. “Comparison of the Anesthesia Efficacy of Levobupivacaine-Fentanyl With Bupivacaine-Fentanyl in Pediatric Patients Undergoing Caudal Blockage for Umbilical Surgery”. Tạp Chí Y Dược lâm sàng 108, Vol. 14, no. 4, June 2019, https://tcydls108.benhvien108.vn/index.php/YDLS/article/view/55.