Micheletti, A. M. and Pistoia, A. (1995) “A note on the resonance set for a semilinear elliptic equations and an application to jumping nonlinearities”, Topological Methods in Nonlinear Analysis, 6(1), pp. 67–80. Available at: https://apcz.umk.pl/TMNA/article/view/TMNA.1995.032 (Accessed: 29 March 2024).