PIEKARSKI, S. A relaxation model of phonon gas interaction with an external field. Archives of Acoustics, [S. l.], v. 16, n. 3-4, p. 559–569, 1991. Disponível em: https://acoustics.ippt.gov.pl/index.php/aa/article/view/1249. Acesso em: 4 mar. 2026.