Van Ommeslaghe, B. “Etude économique De l’implantation d’une Usine sidérurgique”. JORBEL - Belgian Journal of Operations Research, Statistics, and Computer Science, vol. 3, no. 3-4, May 1963, pp. 46-53, https://www.orbel.be/jorbel/index.php/jorbel/article/view/462.