Ha, C.-W. and Kuo, C.-C. (1998) “On the solvability of a two point boundary value problem at resonance II”, Topological Methods in Nonlinear Analysis, 11(1), pp. 159–168. Available at: https://apcz.umk.pl/TMNA/article/view/TMNA.1998.010 (Accessed: 22 July 2024).