“ Invariant Submanifolds of a Manifold Admitting F(a1,a2,a3,. An) - Structure”. Journal of International Academy of Physical Sciences 12, no. 1-4 (December 15, 2008): 111–118. Accessed October 23, 2026. http://www.iaps.org.in/journal/index.php/journaliaps/article/view/846.