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3. N. N. Bogoliubov and D. V. Shirkov, Nuovo Cimento, 3, 845 (1956).
4. N. N. Bogoliubov and D. V. Shirkov, Introduction to the Theory of Quantum Fields [in Russian], Nauka, Moscow (1957, 1973, 1976, 1986); English transl., Wiley, New York (1959, 1980).
5. N. N. Bogoliubov, A. A. Logunov, and I. T. Todorov, Foundations of the Axiomatic Approach in Quantum Field Theory [in Russian], Nauka, Moscow (1969); English transl.: Introduction to Axiomatic Quantum Field Theory, Benjamin, Reading, Mass. (1975); N. N. Bogoliubov, A. A. Logunov, A. I. Oksak, and I. T. Todorov, General Principles of Quantum Field Theory [in Russian], Nauka, Moscow (1987); English transl., Kluwer, Dordrecht (1990).