Figueroa R, López Pouso R, Rodríguez-López J. A version of Krasnosel’skiĭ’s compression-expansion fixed point theorem in cones for discontinuous operators with applications. TMNA [Internet]. 2018 May 21 [cited 2024 Jul. 22];51(2):493-510. Available from: https://apcz.umk.pl/TMNA/article/view/TMNA.2018.003