FERNANDEZ-PÉREZ, A. Normal forms of Levi-flat hypersurfaces with Arnold type singularities. ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE, [S. l.], v. 13, n. 3, p. 745-774, 2014. DOI: 10.2422/2036-2145.201112_003. Disponível em: https://journals.sns.it/index.php/annaliscienze/article/view/354. Acesso em: 20 feb. 2026.