Using topological degree arguments, several existence theorems are proved for the following system of nonlocal resonant boundary value problem (Formula presented.)where (Formula presented.) is continuous and bounded, (Formula presented.) has bounded variation (Formula presented.)
Mawhin, J., & Szymańska-Dȩbowska, K. (2015). Second-order ordinary differential systems with nonlocal Neumann conditions at resonance. Annali di Matematica Pura ed Applicata. Submitted. https://doi.org/10.1007/s10231-015-0532-9 (Original work published 2015)