Showkat Ahmad Wani, and Baby Shahnaz Geelani. “Incidence of Failed Subarachnoid Block in Patients Undergoing Caesarean Section”. International Journal of Health and Clinical Research, vol. 5, no. 2, Jan. 2022, pp. 759-62, https://ijhcr.com/index.php/ijhcr/article/view/4834.