M. RAMZAN, A. NAZIR, and M. R. MUFTI. “Proper Curvature Collineations of Plane Symmetric Static Spacetime in f(R) Theory of Gravity”. Sindh University Research Journal - SURJ (Science Series), Vol. 50, no. 1, Apr. 2020, https://sujo.usindh.edu.pk/index.php/SURJ/article/view/1285.