SPAEY, J. l’Europe et la Belgique face au défi Américain. JORBEL - Belgian Journal of Operations Research, Statistics, and Computer Science, [S. l.], v. 8, n. 3, p. 2–17, 1968. Disponível em: https://www.orbel.be/jorbel/index.php/jorbel/article/view/317. Acesso em: 6 may. 2024.