GRZYB, A. On Dynamic Properties of Two Models of Beam on Nonlinear Foundation Subjected to Moving Load. Engineering Transactions, [S. l.], v. 41, n. 3-4, p. 337–350, 1993. Disponível em: http://et.ippt.gov.pl/index.php/et/article/view/1573. Acesso em: 17 jan. 2026.