vol. 40, no. 1 (2020)

A multiplicity theorem for parametric superlinear (p,q)-equations
Florin-Iulian Onete, Nikolaos S. Papageorgiou, Calogero Vetro
Opuscula Math. 40, no. 1 (2020), 131-149, https://doi.org/10.7494/OpMath.2020.40.1.131