Singh, Kamla D., and Mukut Mani Tripathi. “Semi-Invariant Submanifolds of an Almost R-Paracontact Riemannian Manifold”. The Journal of the Indian Mathematical Society 60, no. 1-4 (December 1, 1994): 29–40. Accessed May 3, 2024. http://informaticsjournals.com/index.php/jims/article/view/21913.