Baral, Pankaj, et al. “Postoperative Analgesic Effect of Morphine Added to Ropivacaine for Fascia Iliaca Compartment Block Following Femoral Fracture Surgeries: A Randomized Controlled Trial”. Journal of BP Koirala Institute of Health Sciences, vol. 4, no. 2, Dec. 2021, pp. 13-18, doi:10.3126/jbpkihs.v4i2.41447.