1. D. N. Klyshko, Photons and Nonlinear Optics (Nauka, Moscow, 1980).
2. K. Mattle, H. Weinfurter, P. G. Kwiat, and A. Zeilinger, Phys. Rev. Lett. 76, 4656 (1996).
3. A. V. Belinsky and D. N. Klyshko, Laser Phys. 4, 663 (1994).
4. S. A. Akhmanov and S. Yu. Nikitin, Physical Optics (Mosk. Gos. Univ., Moscow, 1998).
5. S. A. Akhmanov, V. A. Vysloukh, and A. S. Chirkin, The Optics of Femtosecond Pulses (Nauka, Moscow, 1988).