A. MOSSA, M. Theoretical Study of Longitudinal Vibrations of Two Coupled Crystal Slabs Using Difference Equations Method. Rafidain Journal of Science, [S. l.], v. 16, n. 4, p. 89–94, 2005. DOI: 10.33899/rjs.2005.41461. Disponível em: https://jamh.uomosul.edu.iq/index.php/rsci/article/view/46702. Acesso em: 29 sep. 2025.