CHOLEWA, Wojciech. The characteristic differential spectrum of a conventional substitute signal source in machinery testing. Archives of Acoustics, [S. l.], v. 1, n. 3, p. 215–230, 2016. Disponível em: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/3515. Acesso em: 29 apr. 2025.