1. A. A. Grib, S.G. Mamayev, and V.M. Mostepanenko, Vacuum Quantum Effects in Strong Fields (Energoatomizdat, Moscow, 1988, in Russian; English translation: Friedmann Lab. Publ., St. Petersburg, 1994).
2. N.D. Birrell and P. C. W. Davies, Quantum Fields in Curved Space (Cambridge Univ. Press, Cambridge, 1982).
3. A. A. Grib and S. G. Mamayev, Yadernaya Fizika 10, 1276 (1969); Sov. J. Nucl. Phys. (USA) 10, 722 (1970).
4. A. A. Grib, Early Expanding Universe and Elementary Particles (Friedmann Lab. Publ., St. Petersburg, 1995).
5. A. A. Grib and V. Yu. Dorofeev, Int. J. Mod. Phys. D 3, 731 (1994).