S. Z. . HAIDER, Y. . SAEED, M. . AKRAM, and S. . KHAWAJA, “Comparison of Quincke and Pencil-point bevels in 25-G needles regarding post dural puncture headache in Caesarean Section”., Annals KEMU, vol. 11, no. 2, pp. 81–82, Jan. 2021.