BŁACHOWICZ, T. Phenomenological model of changes in the speed of a sound wave in crystals caused by dopants. Archives of Acoustics, [S. l.], v. 29, n. 3, 2004. Disponível em: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/493. Acesso em: 26 apr. 2025.