Sakharova Е.; YAMPOLSKY, A. Powers of the curvature operator of space forms and geodesics of the tangent bundle. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 56, n. 9, p. 1231–1243, 2004. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3837. Acesso em: 5 dec. 2025.