Rahman, M. A., A. M. Alam, M. A. Mandal, M. Kamruzzaman, M. A. Kabir, S. A. Begum, and C. S. Karmakar. “Incidence of Postdural Puncture Headache After Caesarean Section Comparison Between 25G and 27G Quincke Variety of Spinal Needle”. KYAMC Journal, vol. 7, no. 2, Aug. 2017, pp. 762-9, doi:10.3329/kyamcj.v7i2.33832.