DIALLO, M.; IGNATOV, T. Representation of the reciprocal moments of linear combinations of independent exponential variates. Ann. Sofia Univ. Fac. Math. and Inf., [S. l.], v. 87, p. 241–248, 1995. Disponível em: https://admin.uni-sofia.bg/index.php/fmi/article/view/417. Acesso em: 15 jan. 2025.