Multiplicity of positive and nodal solutions for nonlinear elliptic problems in ℝ N Daomin Cao; Ezzat S. Noussair — 1996 Annales de l'I.H.P. Analyse non linéaire
Existence and uniqueness results on Single-Peaked solutions of a semilinear problem Daomin Cao; Ezzat S. Noussair; Shusen Yan — 1998 Annales de l'I.H.P. Analyse non linéaire