Narain, Dhruwa, and Sunil Yadav. “On Weak Concircular Symmetries of Lorentzian Concircular Structure Manifolds”. CUBO, A Mathematical Journal 15, no. 2 (June 1, 2013): 33–42. Accessed October 12, 2025. https://cubo.ufro.cl/index.php/cubo/article/view/1307.