Iqbal, Muhammad Rashid, et al. “COMPARISON OF ANALGESIC EFFICACY OF TRANSFORAMINAL VS CAUDAL EPIDURAL APPROACHES FOR UNILATERAL LUMBAR RADICULOPATHY”. Pakistan Armed Forces Medical Journal, vol. 70, no. Suppl-1, Jan. 2020, pp. S135-39, https://pafmj.org/PAFMJ/article/view/3810.