1. N. N. Bogolyubov and D. V. Shirkov, “Introduction to the theory of quantized fields,” Intersci. Monogr. Phys. Astron. 3, 1–720 (1959).
2. D. V. Shirkov, “A few lessons from perturbative pQCD analysis at low energies,” Nucl. Phys. Proc. Suppl. 225–227, 5–9 (2012).
3. L. N. Lipatov, “Divergence of the perturbation theory series and the quasiclassical theory,” Sov. Phys. JETP 45, 216–223 (1977) (Zh. Eksp. Teor. Fiz. 72, 411–427 (1977)).
4. C. Itzykson, G. Parisi, and J.-B. Zuber, “Asymptotic estimates in quantum electrodynamics,” Phys. Rev. D 16, 996–1013 (1977).
5. E. B. Bogomolny and Y. A. Kubyshin, “Asymptotical estimates for graphs with a fixed number of fermionic loops in quantum electrodynamics,” in The Extremal Configurations with the Symmetry Group O(2) × O(3), Sov. J. Nucl. Phys. 35, 114–199 (1982) (Yad. Fiz. 35, 202–212 (1982)).