Lafuente López, Javier. “A Geodesic Completenss Theorem for Locatly Symmetric Lorentz Manifolds”. Revista Matemática Complutense 1, no. 1 (January 1, 1988): 101. Accessed July 30, 2026. https://revistas.ucm.es/index.php/REMA/article/view/REMA8888110101A.