Vibha Srivastava, and P. N. Pandey. “On a Quasi-Einstein Kӓhler Manifold and Its Application to General Relativity”. Journal of International Academy of Physical Sciences, vol. 22, no. 1, Mar. 2018, pp. 11-23, https://www.iaps.org.in/journal/index.php/journaliaps/article/view/108.