El Maqrini, H., and J. Teghem. “Efficiency of Metaheuristics to Schedule General Flexible Job-Shop”. JORBEL - Belgian Journal of Operations Research, Statistics, and Computer Science, vol. 41, no. 1-2, June 2001, pp. 83-102, https://www.orbel.be/jorbel/index.php/jorbel/article/view/347.