Khalilia, A., R. Jha, and D. Samaratunga. “Spectrally Formulated User-Defined Element in Conventional Finite Element Environment for Wave Motion Analysis in 2-D Composite Structures”. European Journal of Computational Mechanics, vol. 25, no. 6, Mar. 2019, pp. 446-74, https://journals.riverpublishers.com/index.php/EJCM/article/view/677.