@article{de lis_de léon_2015, title={Multiplicity of solutions to a concave-convex problem}, volume={15}, ISSN={1536-1365}, number={1}, journal={Advanced Nonlinear Studies}, publisher={Advanced Nonlinear Studies}, author={De Lis, Jos̈e C. Sabina and De Léon, Sergio Segura}, year={2015}, pages={61-90} }