Rahman, Sh. “Geometry of Hypersurfaces of a Quarter Symmetric Non Metric Connection in a Quasi-Sasakian Manifold”. Carpathian Mathematical Publications 7, no. 2 (December 15, 2015): 226–235. Accessed January 18, 2025. https://personnel.pnu.edu.ua/index.php/cmp/article/view/1402.