1. A. A. Grib, S. G. Mamayev, and V.M. Mostepanenko, Vacuum Quantum Effects in Strong Fields [in Russian], Énergoatomizdat, Moscow (1988); English transl., Friedmann Laboratory Publ., St. Petersburg (1994).
2. Cambridge Monogr. Math. Phys.;N D Birrell,1984
3. V. B. Bezerra, V. M. Mostepanenko, and C. Romero, Modern Phys. Lett. A, 12, 145–154 (1997).
4. M. Bordag, J. Lindig, V. M. Mostepanenko, and Yu. V. Pavlov, Internat. J. Mod. Phys. D, 6, 449–463 (1997).
5. Yu. V. Pavlov, Theor. Math. Phys., 140, 1095–1108 (2004).