BEŁDZIŃSKI, Michał, GALEWSKI, Marek and KOSSOWSKI, Igor. Existence results for semi-linear differential equations with nonlocal boundary value conditions. Topological Methods in Nonlinear Analysis. Online. 22 March 2026. pp. 1 - 21. [Accessed 26 March 2026]. DOI 10.12775/TMNA.2025.042.