Varun, M. N., et al. “Effect of Ultrasound Guided Sciatic Nerve Block on Post Operative Analgesia in Patients Undergoing below Knee Orthopedic Surgeries under Spinal Anaesthesia – Prospective Randomized Study”. Karnataka Anaesthesia Journal, vol. 18, no. 1-2, June 2020, pp. 09-15, doi:10.4103/kaj/2020/v18i1-2/158500.