Saha, D., S. Bhattacharya, A. Uzzaman, S. Mazumdar, and A. Mazumdar. “Morphometric Study of Variations of Sacral Hiatus Among West Bengal Population and Clinical Implications”. Italian Journal of Anatomy and Embryology, vol. 121, no. 2, June 2016, pp. 165-71, https://oajournals.fupress.net/index.php/ijae/article/view/1469.