Ben-Elechi, S. ., and H. . Naceur. “Optimisation Topologique De Surfaces Additionnelles De tôles Embouties”. European Journal of Computational Mechanics, vol. 15, no. 7-8, June 2006, pp. 909-43, https://journals.riverpublishers.com/index.php/EJCM/article/view/2055.