Monotone method for the Neumann problem with lower and upper solutions in the reverse order

@article{Cabada2001MonotoneMF,
  title={Monotone method for the Neumann problem with lower and upper solutions in the reverse order},
  author={Alberto Cabada and Patrick Habets and Susana Lois},
  journal={Applied Mathematics and Computation},
  year={2001},
  volume={117},
  pages={1-14}
}