S. MIR - Department of Mathematics, Payame Noor University, Tehran, Iran., P.O.Box ۱۹۳۹۵-۳۶۹۷
M.B. Ghaemi - Department of Mathematics, Iran University of Science and Technology, Tehran, Iran
G. A. Afroozi - Department of Mathematics, Faculty of Mathematics Sci- ences, University of Mazandaran, Babolsar, Iran

The existence of infinitely many solutions is established for a class of nonlinear functionals involving the p-biharmonic operator with nonhomoge- neous Neumann boundary conditions. Using a recent critical-point theorem for nonsmooth functionals and under appropriate behavior of the nonlinear term and nonhomogeneous Neumann boundary conditions, we obtain the result.