Mobin Ahmad, and Kashif Ali. “Semi-Invariant Submanifolds of Nearly Hyperbolic Cosymplectic Manifold”. Global Journal of Science Frontier Research 13, no. F4 (March 15, 2013): 73–81. Accessed May 4, 2024. https://journalofscience.org/index.php/GJSFR/article/view/858.