2005-Oujda International Conference on Nonlinear Analysis, Oujda, Morocco. Electronic Journal of Differential Equations, Conference 14 (2006), pp. 181-190. Title: On the spectrum of the p-Laplacian operator for Neumann eigenvalue problems with weights Authors: Siham El Habib (Univ. Mohamed 1er, Oujda, Morocco) Najib Tsouli (Univ. Mohamed 1er, Oujda, Morocco) Abstract: This paper is devoted to study the spectrum for a Neumann eigenvalue problem involving the p-Laplacian operator with weight in a bounded domain. Published September 20, 2006. Math Subject Classifications: 58E05, 35J65, 56J20. Key Words: Nonlinear eigenvalue problem; p-Laplacian; indefinite weight; Neumann boundary value problem.