Singh, K. P., and M. Dewri. “Some Spherically Symmetric R/W Universe Interacting With Vacuum B–D Scalar Field”. Ukrainian Journal of Physics 60, no. 11 (January 10, 2019): 1177. Accessed June 25, 2024. https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2019155.