GUIDI, C.; MARTINO, V. Horizontal curvatures and classification results. Annales Fennici Mathematici, [S. l.], v. 45, n. 2, p. 829–840, 2020. DOI: 10.5186/aasfm.2020.4541. Disponível em: https://afm.journal.fi/article/view/135886. Acesso em: 20 maj. 2024.