GHIBA, I.-D. Spatial estimates concerning the harmonic vibrations in rectangular plates with voids. Archives of Mechanics, Warsaw, Poland, v. 60, n. 3, p. 263–279, 2008. DOI: 10.24423/aom.267. Disponível em: http://am.ippt.gov.pl/index.php/am/article/view/v60p263. Acesso em: 17 jan. 2026.