1. On a nonresonance condition between the first and the second eigenvalues for the p-Laplacian;Anane;Internat. J. Math. Math. Sci.,2001
2. I. Babuska, J. Osborn, Eigenvalue Problems, Handbook of Numerical Analysis, Vol. II, North-Holland, Amsterdam, 1991, pp. 641–787.
3. Existence of positive solutions of a semilinear elliptic equation in R+N with a nonlinear boundary condition;Chipot;J. Math. Anal. Appl.,1998
4. On the solutions to some elliptic equations with nonlinear boundary conditions;Chipot;Adv. Differential Equations,1996
5. P. Ciarlet, The finite element method for elliptic problems, Studies in Mathematics and its Applications, Vol. 4, North-Holland Publishing Co., Amsterdam, New York, Oxford, 1978.