A Multiplicity Result for Some Integro-differential Biharmonic Equation in R4. Journal of Partial Differential Equations, [S. l.], v. 29, n. 2, p. 102–115, 2016. DOI: 10.4208/jpde.v29.n2.2. Disponível em: https://global-sci.com/index.php/jpde/article/view/4263. Acesso em: 6 dec. 2025.