Nols, E. (1967) “Réflexions en vue d’une ventilation régionale des statistiques”, JORBEL - Belgian Journal of Operations Research, Statistics, and Computer Science, 7(3-4), pp. 45–52. Available at: https://www.orbel.be/jorbel/index.php/jorbel/article/view/189 (Accessed: 4 May 2024).