PETROVA, I. A generalization of the Levi-Civitae connection on Riemannian manifolds. Ann. Sofia Univ. Fac. Math. and Inf., [S. l.], v. 86, n. 1, p. 35–42, 1994. Disponível em: https://stipendii.uni-sofia.bg/index.php/fmi/article/view/434. Acesso em: 21 nov. 2024.