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 Unilateral problem for a nonlinear wave equation with p-Laplacian operator Carlos Raposo,Ducival Pereira,Celsa Maranhão Keywords:Unilateral problem, p-Laplacian operator, global solution. Abstract: This work deals with the unilateral problem for the $p$-Laplacian operator with source term. Using an appropriate penalization, we obtain a variational inequality for the equation perturbed and then the existence of solutions is analyzed.