Iranian Mathematical Society (IMS) Bulletin of the Iranian Mathematical Society 1017-060X 33 No. 2 2011 01 20 The Nehari Manifold for a Class of Indefinite Weight Semilinear Elliptic Equations49 59 en G. A. Afrouzi S. Khademloo 2011 01 20 Nehari manifold Fibrering maps Critical exponent Indefinite weight function