SIVERSON, Randolph; ALKER, Hayward R. Hayward R. Alker Jr. et al. Mathematical approaches to politics. Amsterdam : Elsevier Scientific Publishing Company, 1973. 475 p. Foro Internacional, México, Ciudad de México, v. 15, n. 4, p. 638–640, 1975. Disponível em: https://forointernacional.colmex.mx/index.php/fi/article/view/703. Acesso em: 11 jul. 2025.