Bahrouni, Anouar, Vicenţiu D. Rădulescu, and Patrick Winkert. 2021. “Small Perturbations of Robin Problems Driven by the $p$-Laplacian Plus a Positive Potential”. Topological Methods in Nonlinear Analysis 57 (2):663-73. https://apcz.umk.pl/TMNA/article/view/TMNA.2020.060.