Dhar, S., M. Paul, N. C. Sarkar, M. Zebunnesa, A. F. Hoque, G. A. Chowdhury, and A. S. Alam. “Post-Spinal Headache After Caesarean Section – Effect of Approach Into Dura-Arachnoid Sac”. Journal of Bangladesh College of Physicians and Surgeons, vol. 35, no. 3, Oct. 2017, pp. 123-7, doi:10.3329/jbcps.v35i3.34342.