CEMPEL, C. Drgania Uderzeniowe Dwu Niezależnych Układów. Engineering Transactions, [S. l.], v. 19, n. 2, p. 301–307, 1971. Disponível em: https://et3.ippt.pan.pl/index.php/et/article/view/2542. Acesso em: 11 jun. 2025.