The nonmonotonic differentiable solutions of equations involving iterated functional series are investigated. Conditions for the existence, uniqueness, and stability of such solutions are given. These extend earlier results due to Murugan and Subrahmanyam.
"Differentiable Solutions of Equations Involving Iterated Functional Series." Abstr. Appl. Anal. 2008 1 - 13, 2008. https://doi.org/10.1155/2008/636843