This paper deals with the existence of mild and integral solutions for a class of functional differential equations. The technique used is a generalization of the classical Darbo fixed point theorem for Fréchet spaces associated with the concept of measure of noncompactness.
"Measure of noncompactness and semilinear differential equations in Fréchet spaces." Tbilisi Math. J. 12 (1) 69 - 81, January 2019. https://doi.org/10.32513/tbilisi/1553565627