Geodesic
Two constant sign solutions for a nonhomogeneous Neumann boundary value problem
Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica, no. 14 (2015).

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We consider a nonlinear Neumann problem with a nonhomogeneous elliptic differential operator. With some natural conditions for its structure and some general assumptions on the growth of the reaction term we prove that the problem has two nontrivial solutions of constant sign. In the proof we use variational methods with truncation and minimization techniques. 
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     author = {Klimczak, Liliana},
     title = {Two constant sign solutions for a nonhomogeneous {Neumann} boundary value problem},
     journal = {Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica},
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Klimczak, Liliana. Two constant sign solutions for a nonhomogeneous Neumann boundary value problem. Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica, no. 14 (2015). http://geodesic.mathdoc.fr/item/AUPCM_2015_14_a10/