BENZ, W. Hyperbolic and euclidean distance functions. Ann. Sofia Univ. Fac. Math. and Inf., [S. l.], v. 89, p. 59–67, 1997. Disponível em: https://ftl5.uni-sofia.bg./index.php/fmi/article/view/355. Acesso em: 24 nov. 2024.