A nonlinear boundary problem involving the p-bilaplacian operator. - Abdelouahed El Khalil; Siham Kellati; Abdelfattah Touzani (Int. J. Math. Math. Sci., 2005)

Simplicity and stability of the first eigenvalue of a nonlinear elliptic system. - Abdelouahed El Khalil; Said El Manouni; Mohammed Ouanan (Int. J. Math. Math. Sci., 2005)