@article{sabina de lis_2020, title={Nonlinear flux “concave–convex” problems: a fibering method approach}, volume={5}, ISSN={2538-225X}, DOI={10.1007/S43036-020-00092-4}, number={4}, journal={Advances in Operator Theory}, publisher={Birkhauser}, author={Sabina de Lis, José C.}, year={2020}, pages={1738-1753} }