Mencik, J.-M. ., M. . Ichchou, and L. . Jézéquel. “Propagation Multimodale Dans Les systèmes périodiques couplés”. European Journal of Computational Mechanics, vol. 15, no. 1-3, July 2006, pp. 293-05, https://journals.riverpublishers.com/index.php/EJCM/article/view/2153.