Iqbal, Saleem, et al. “ROLE OF PRELOADING WITH AND WITHOUT INTRAMUSCULAR EPHEDRINE TO PREVENT POST SPINAL HYPOTENSION IN ELDERLY PATIENTS: Post Spinal Hypotension in Elderly Patients”. Pakistan Armed Forces Medical Journal, vol. 65, no. 2, Apr. 2015, pp. 184-8, https://pafmj.org/PAFMJ/article/view/748.