1. R. P. Feynman and A. R. Hibbs,Quantums Mechanics and Path Integrals, McGraw-Hill, New York (1965).
2. A. A. Slavnov and L. D. Faddeev,Gauge Fields: Introduction to Quantum Theory [in Russian], Nauka, Moscow (1978); English transl., L. D. Faddeev and A. A. Slavnov, Benjamin, London (1980).
3. V. N. Popov and V. S. Yarunin,Collective Effects in Quantum Statistics of Radiation and Matter Kluwer, Dordrecht (1988).
4. E. A. Kochetov and V. S. Yarunin,Physica Scripta,51, 46 (1995).
5. Yu. Izumov, M. Katsnel’son, and Yu. Skryabin,Itinerant Electron Magnetism [in Russian], Nauka, Moscow (1994).