STEGANTSEVA, P.; GRECHNEVA, M. Two-dimensional nonisotropic surfaces with flat normal connection and a nondegenerate Grassmann image of constant curvature in the Minkowski space. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 76, n. 4, p. 533–551, 2024. DOI: 10.3842/umzh.v74i4.6743. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/6743. Acesso em: 27 apr. 2025.