MANEV, H. Third Natural Connection on Riemannian Π-manifolds. Proceedings of the Bulgarian Academy of Sciences, Sofia, Bulgaria, v. 76, n. 5, p. 657–666, 2023. DOI: 10.7546/CRABS.2023.05.01. Disponível em: https://www.proceedings.bas.bg/index.php/cr/article/view/306. Acesso em: 20 jul. 2024.