1. Dobrushin, R.L.: Commun. Math. Phys.32, 269 (1973)
2. Hoghton, A., Kadanoff, L.P.: In: Renormalization group in critical phenomena and quantum field theory. Proceeding of a Conference 1973. Gunton, J.D., Green, M.S. (eds.) Dept. of Phys., Temple University, Philadelphia
3. Nelson, D., Fisher, M.: Ann. Phys.91, 226 (1975)
4. Gallavotti, G., Martin-Löf, A., Miracle-Sole, S.: Lecture Notes in Physics20, 162 (1971)
5. Gruber, Ch., Kunz, H.: Commun. Math. Phys.22, 133 (1971)