Ezzinbi, Khalil, Valerie Nelson, and Gaston N‘Gu´er´ekata. 2008. “𝐶⁽ⁿ⁾-Almost Automorphic Solutions of Some Nonautonomous Differential Equations”. CUBO, A Mathematical Journal 10 (2):61–74. https://www.perspectivasdelacomunicacion.cl/ojs/index.php/cubo/article/view/1516.