MELESE, J. Systèmes et structures. JORBEL - Belgian Journal of Operations Research, Statistics, and Computer Science, [S. l.], v. 12, n. 1, p. 17–28, 1972. Disponível em: https://www.orbel.be/jorbel/index.php/jorbel/article/view/195. Acesso em: 19 may. 2024.