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, vol. 25, no. 1, Mar. 2021, pp. 37-49, https://www.iaps.org.in/journal/index.php/journaliaps/article/view/55.