Ventura, E. “Analyse Du Comportement Des détaillants Et Politique Des Ristournes”. JORBEL - Belgian Journal of Operations Research, Statistics, and Computer Science 3, no. 3-4 (May 1, 1963): 35–45. Accessed April 23, 2024. https://www.orbel.be/jorbel/index.php/jorbel/article/view/461.