KAGAN, F. Some theorems concerning the characterization of gamma-distribution and near to it ones. Lithuanian Mathematical Journal, [S. l.], v. 8, n. 2, p. 265–278, 1968. DOI: 10.15388/LMJ.1968.20214. Disponível em: https://journals.vu.lt./LMJ/article/view/20214. Acesso em: 26 apr. 2025.