RUTGERS, A. Rational determination of the marketing expenditure. JORBEL - Belgian Journal of Operations Research, Statistics, and Computer Science, [S. l.], v. 11, n. 2, p. 2–12, 1971. Disponível em: https://www.orbel.be/jorbel/index.php/jorbel/article/view/354. Acesso em: 15 may. 2024.