OLSZOWSKI, Bogdan. O stateczności sprężystej układów niezachowawczych. Engineering Transactions, [S. l.], v. 14, n. 1, p. 35–47, 1966. Disponível em: https://et.ippt.pan.pl/index.php/et/article/view/3318. Acesso em: 9 oct. 2025.