1. A. A. Vladimirov, D. I. Kazakov, and O. V. Tarasov, Zh. Eksp. Teor. Fiz.,77, 1035 (1979); O. V. Tarasov and A. A. Vladimirov, Preprint E2-80-483 [in English], JINR, Dubna (1980) (and the references quoted there).
2. O. I. Zav'yalov, Renormalized Feynman Diagrams [in Russian], Nauka, Moscow (1979).
3. S. A. Anikin, O. I. Zav'yalov, and N. I. Karchev, Teor. Mat. Fiz.,46, 3 (1981).