Alegbe TS, Makama EK, Naandoet BF, Algahanuna AA, Akerel DO, Percy KA, et al. Geometric and Causal Structure of Schwarzschild–de Sitter and Kerr–de Sitter Spacetimes. NJP [Internet]. 2026 Jun. 19 [cited 2026 Jun. 25];35(3):83-90. Available from: https://njp.nipngr.org/index.php/njp/article/view/562