Papageorgiou, N. S., Vetro, C. and Vetro, F. (2017) “Multiple nodal solutions for semilinear Robin problems with indefinite linear part and concave terms”, Topological Methods in Nonlinear Analysis, 50(1), pp. 269–286. Available at: https://apcz.umk.pl/TMNA/article/view/TMNA.2017.029 (Accessed: 22 July 2024).