Thapa, Puja, Amir Babu Shrestha, and Mallika Rayamajhi. 2018. “Anesthetic Effects of Varying Doses of Fentanyl Combined With Spinal Bupivacaine in Caesarean Delivery”. Medical Journal of Shree Birendra Hospital 17 (1):3-10. https://nepjol.info/index.php/MJSBH/article/view/18614.