KOSIŃSKI, Witold; NOWAK, Zdzisław; PĘCHERSKI, Ryszard. Professor Piotr Perzyna - in memoriam. Engineering Transactions, [S. l.], v. 61, n. 3, p. 167–171, 2013. Disponível em: https://et3.ippt.pan.pl/index.php/et/article/view/13. Acesso em: 10 jun. 2025.