1. A. Jaffe and J. Glimm, Quantum physics. A functional integral point of view, Springer Verlag Heidelberg 1981
2. K. Osterwalder and S. Schrader,-Aadorns for Euclidean Greens functions I, II, Commun. Math. Phys. 31,83 (1973)
3. K. Osterwalder and S. Schrader,-Aadorns for Euclidean Greens functions I, II, Commun. Math. Phys. 42, 281 (1975)
4. K. Wilson, Phys. Rev. D3, 1818 (1971)
5. K. Wilson, Rev. Mod. Phys. 55, 583 (1983)