Radi, Abdel, Adam Haroun Ishag Gary, and Musa Adam Abdullah. “ON SOME MANIFOLDS OF CONSTANT NEGATIVE CURVATURE”. IJRDO -JOURNAL OF MATHEMATICS 9, no. 1 (January 28, 2023): 24-30. Accessed May 2, 2024. https://ijrdo.org/index.php/m/article/view/5535.