HRISTOV, A.; KOSTADINOV, G. MANIFOLDS ADMITTING A STRUCTURE OF FOUR DIMENTIONAL ALGEBRA OF AFFINORS. Ann. Sofia Univ. Fac. Math. and Inf., [S. l.], v. 103, p. 89–95, 2016. Disponível em: https://ftl5.uni-sofia.bg./index.php/fmi/article/view/57. Acesso em: 24 nov. 2024.