BENZENATI, L., & MEBARKI, K. (2023). An extension of Krasnoselskii’s cone fixed point theorem for a sum of two operators and applications to nonlinear boundary value problems. Studia Universitatis Babeș-Bolyai Mathematica, 68(2), 423–438. https://doi.org/10.24193/subbmath.2023.2.16