MOHAMED H. A. HAMED; ISLAM F. M. OSMAN; MOHAMMED B.A. MOHAMMAD; ARAFAT ABDELHAMEED ABDELRAHMANN; ASMAA ELTAYEB ALI ELHASSAN. Contact Lorentzian Manifolds of Constant Curvature and CR-Manifolds. Journal of The Faculty of Science and Technology, n. 8, p. 113 - 120, 8 Feb. 2022.