GRYBOŚ, R. Wtórne Uderzenie Proste w Oscylator Harmoniczny. Engineering Transactions, [S. l.], v. 9, n. 2, p. 269–277, 1961. Disponível em: https://et.ippt.pan.pl/index.php/et/article/view/2887. Acesso em: 23 jul. 2025.