S.PAPAGEORGIOU, N.; D. RĂDULESCU, V. Multiplicity of solutions for Robin problems with double resonance. ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE, [S. l.], v. 18, n. 1, p. 145-201, 2018. DOI: 10.2422/2036-2145.201605_005. Disponível em: http://20.103.181.36/index.php/annaliscienze/article/view/568. Acesso em: 27 may. 2025.