S. P. Maurya, S. K. Pandey, and R. N. Singh. “Almost Pseudo Semi-Conformally Symmetric Ricci-Recurrent Space-Time”. Journal of International Academy of Physical Sciences 25, no. 1 (March 15, 2021): 37–49. Accessed May 15, 2024. https://www.iaps.org.in/journal/index.php/journaliaps/article/view/55.