Aizicovici, S., Papageorgiou, N. S. and Staicu, V. (2010) “Existence and multiplicity of solutions for resonant nonlinear Neumann problems”, Topological Methods in Nonlinear Analysis, 35(2), pp. 235–252. Available at: https://apcz.umk.pl/TMNA/article/view/TMNA.2010.014 (Accessed: 13 December 2024).