  We associate to any convenient nondegenerate Laurent polynomial on the
complex torus (C^*)^n a canonical Frobenius-Saito structure on the base space
of its universal unfolding. According to the method of K. Saito (primitive
forms) and of M. Saito (good basis of the Gauss-Manin system), the main
problem, which is solved in this article, is the analysis of the Gauss-Manin
system of the Laurent polynomial (or its universal unfolding) and of the
corresponding Hodge theory.
