Shehzad, Farrukh, et al. “COMPARISON OF PARAMEDIAN WITH MIDLINE TECHNIQUE OF SPINAL ANAESTHESIA IN ELDERLY: Spinal Anaesthesia”. Pakistan Armed Forces Medical Journal, vol. 68, no. 5, Oct. 2018, pp. 1168-72, https://pafmj.org/PAFMJ/article/view/2284.