Figueroa, R., López Pouso, R., & Rodríguez-López, J. (2018). A version of Krasnosel’skiĭ’s compression-expansion fixed point theorem in cones for discontinuous operators with applications. Topological Methods in Nonlinear Analysis, 51(2), 493–510. Retrieved from https://apcz.umk.pl/TMNA/article/view/TMNA.2018.003