Ram Nivas, Surendra Yadav (2008) “ Invariant Submanifolds of a Manifold Admitting F(a1,a2,a3,. an) - Structure”, Journal of International Academy of Physical Sciences, 12(1-4), pp. 111–118. Available at: https://www.iaps.org.in/journal/index.php/journaliaps/article/view/846 (Accessed: 13 May 2025).