J.P. Srivastava, Sudershan Khajuria. “A Certain Class of an Almost Complex Manifold”. Journal of International Academy of Physical Sciences 3, no. 1-4 (December 15, 1999): 57–64. Accessed May 7, 2025. https://www.iaps.org.in/journal/index.php/journaliaps/article/view/716.