ALEGBE, Taiye Sereami et al. Geometric and Causal Structure of Schwarzschild–de Sitter and Kerr–de Sitter Spacetimes. Nigerian Journal of Physics, [S. l.], v. 35, n. 3, p. 83–90, 2026. DOI: 10.62292/njp.v35i3.2026.562. Disponível em: https://njp.nipngr.org/index.php/njp/article/view/562. Acesso em: 25 jun. 2026.