Khan, A., S. Feroz, S. Iqbal, M. Sultan, S. Munir, and W. Ahmed. “Comparison of Sphenopalatine Block and Intravenous Paracetamol for the Treatment of Post-Dural Puncture Headache”. Pakistan Armed Forces Medical Journal (PAFMJ), Vol. 72, no. 3, July 2022, pp. 1136-39, doi:10.51253/pafmj.v72i3.7528.