Asymmetric elliptic problems with indefinite weights M. Arias; J. Campos; M. Cuesta; J.-P. Gossez — 2002 Annales de l'I.H.P. Analyse non linéaire
An asymmetric Neumann problem with weights M. Arias; J. Campos; M. Cuesta; J.-P. Gossez — 2008 Annales de l'I.H.P. Analyse non linéaire