Kervijn de Lettenhove, A. (1966) “La statistique et l’efficacité de la politique économique”, JORBEL - Belgian Journal of Operations Research, Statistics, and Computer Science, 6(3-4), pp. 55–71. Available at: https://www.orbel.be/jorbel/index.php/jorbel/article/view/57 (Accessed: 2 May 2024).