1. Sobolev Spaces;Adams,1975
2. Simplicité et isolation de la première valeur propre du p-Laplacien avec poids;Anane;C.R. Acad. Sci. Paris Sér. I Math.,1987
3. A. Anane, N. Tsouli, On the second eigenvalue of the p-Laplacian, Nonlinear Partial Differential Equations (Fès, 1994), Pitman Research Notes Mathematics Series vol. 343, Longman, Harlow, 1996, pp. 1–9.
4. Principles of Non-Newtonian Fluid Mechanics;Astarita,1974
5. Existence results for the p-Laplacian with nonlinear boundary conditions;Bonder;J. Math. Anal. Appl.,2001