RYFFERT, H. XXVIII Open Seminar on Acoustics Gliwice, 7–11 September, 1981. Archives of Acoustics, [S. l.], v. 7, n. 3-4, p. 287–292, 1982. Disponível em: http://acoustics.ippt.gov.pl/index.php/aa/article/view/3289. Acesso em: 18 apr. 2026.