Ganguly, D., S. Dey, and A. Bhattacharyya. “On Trans-Sasakian $3$-Manifolds As $\eta$-Einstein Solitons”. Carpathian Mathematical Publications 13, no. 2 (October 15, 2021): 460–474. Accessed June 16, 2024. https://scijournals.pnu.edu.ua/index.php/cmp/article/view/4275.