BAMBUSI, D. Galerkin averaging method and Poincaré normal form for some quasilinear PDEs . ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE, [S. l.], v. 4, n. 4, p. 669-702, 2009. DOI: 10.2422/2036-2145.2005.4.06. Disponível em: http://20.103.181.36/index.php/annaliscienze/article/view/84. Acesso em: 30 may. 2025.