FIGUEROA, Rubén, LÓPEZ POUSO, Rodrigo and RODRÍGUEZ-LÓPEZ, Jorge. A version of Krasnosel’skiĭ’s compression-expansion fixed point theorem in cones for discontinuous operators with applications. Topological Methods in Nonlinear Analysis. Online. 21 May 2018. Vol. 51, no. 2, pp. 493 - 510. [Accessed 22 July 2024].