M. RAMZAN, Y. AHMAD, and M. R. MUFTI. “Proper Curvature Collineations in Som-Roy Chaudhary Symmetric Space Time”. Sindh University Research Journal - SURJ (Science Series) 49, no. 1 (January 14, 2021). Accessed May 4, 2024. https://sujo.usindh.edu.pk/index.php/SURJ/article/view/2950.