GRZĘDZIŃSKI, J. Subsonic flutter calculation of an aircraft with nonlinear control system based on center-manifold reduction. Archives of Mechanics, Warsaw, Poland, v. 49, n. 1, p. 3–26, 1997. Disponível em: http://am.ippt.gov.pl/index.php/am/article/view/v49p3. Acesso em: 17 jan. 2026.