1. Magnen, J., Nicoló, F., Rivasseau, V., Sénéor, R.: Commun. Math. Phys.108, 257 (1987)
2. Parisi, G.: Phys. Rep.49, 215 (1979)
3. 't Hooft, G.: The Whys of subnuclear physics. Erice 1977, Zichichi, A. (ed.). New York: Plenum Press 1979
4. Rivasseau, V.: Commun. Math. Phys.95, 445 (1984)
5. Lipatov, L.: Sov. Phys. JETP44, 1055 (1976) and45, 216 (1977); JETP Lett.25, 104 (1977)