We prove existence and uniform a-priori estimates for Gibbs states of certa
in classical lattice systems with unbounded spins and n-particle interactio
ns. We use a characterization of Gibbs measures in terms of their Radon-Nik
odym derivatives w.r.t. local shifts of the configuration space and the cor
responding integration by parts formula. Detailed proofs are contained in [
3]. (C) Academie des Sciences/Elsevier, Paris.