MAGNUCKI, K.; WSTAWSKA, I.; KĘDZIA, P. Free flexural vibration of a sandwich beam on an elastic foundation with variable properties. Archives of Mechanics, Warsaw, Poland, v. 75, n. 6, p. 619–646, 2024. DOI: 10.24423/aom.4311. Disponível em: https://am.ippt.pan.pl/index.php/am/article/view/v75p619. Acesso em: 19 nov. 2025.