Udonquak, M. M., Kalu, Q. N., & Eshiet, A. I. (2017). Pethidine and bupivacaine spinal anaesthesia: a comparative evaluation of postoperative complications and recovery profile. International Journal of Research in Medical Sciences, 5(6), 2490–2496. https://doi.org/10.18203/2320-6012.ijrms20172434