1. N. N. Bogoliubov and D. V. Shirkov, Introduction to the Theory of Quantum Fields [in Russian], Nauka, Moscow (1976); English transl., Wiley, New York (1980); J. Collins, Renormalization: An Introduction to Renormalization, the Renormalization Group, and the Operator-Product Expansion, Cambridge Univ. Press, New Rochelle (1984).
2. K. G. Chetyrkin, Nuovo Cimento A, 103, 1653 (1990).
3. A. Connes and D. Kreimer, Comm. Math. Phys., 210, 249 (2000); hep-th/9912092 (1999).
4. A. Connes and D. Kreimer, Comm. Math. Phys., 216, 215 (2001); hep-th/0003188 (2000).
5. D. V. Malyshev, Phys. Lett. B, 578, 231 (2004); hep-th/0307301 (2003).