Maroncelli, Daniel, and Jesús Rodríguez. “Some Existence Results for Nonresonant Difference Equations on Infinite Intervals Subject to Nonlocal Boundary Conditions”. Topological Methods in Nonlinear Analysis 65, no. 1 (February 14, 2025): 123–143. Accessed June 28, 2025. https://apcz.umk.pl/TMNA/article/view/58853.