BONDARENKO, V. G. Jacobi fields on a Riemann manifold. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 58, n. 12, p. 1602–1613, 2006. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3558. Acesso em: 11 apr. 2025.