ADAMCZYK, Jan; BATKO, Wojciech. Professor Zbigniew Witold ENGEL 1933 – 2013. Archives of Acoustics, [S. l.], v. 38, n. 4, p. 453–456, 2013. Disponível em: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/307. Acesso em: 26 apr. 2025.