SAMOKHVALOV, S. E. Group-Theoretic Description of Riemannian Spaces. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 55, n. 9, p. 1238–1248, 2003. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3996. Acesso em: 6 dec. 2025.