GUBRYNOWICZ, Ryszard. The Journal of the Acoustical Society of Japan (E). Archives of Acoustics, [S. l.], v. 6, n. 2, p. 2015, 1981. Disponível em: http://acoustics.ippt.gov.pl/index.php/aa/article/view/3308. Acesso em: 18 apr. 2026.