Pfister, Charles-Edouard2008-11-272008-11-272008-11-27198710.1111/j.1749-6632.1987.tb30052.xhttps://infoscience.epfl.ch/handle/20.500.14299/31877WOS:A1987H172300013symmetry groupergodic probability measuresextremal translation- invariantperturbation expansionsOn the ergodic decomposition of Gibbs random fields for ferromagnetic Abelian lattice modelstext::journal::journal article::research article