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2. C. Itzykson and J.-B. Zuber, Quantum Field Theory, McGraw-Hill, New York (1980).
3. A. A. Slavnov and L. D. Faddeev, Gauge Fields, Introduction to Quantum Theory (Frontiers in Physics, Vol. 50), Reading, Mass. (1980).
4. P. Ramon, Field Theory. A Modern Introductory Course [Russian translation], Mir, Moscow (1984).
5. G. V. Efimov, Problems of the Quantum Theory of Nonlocal Interactions [in Russian], Nauka, Moscow (1985).