1. I. A. Deryugin, I. P. Pugach, and A. I. Solomko, Quantum Electronics (Proc. Repub. Seminar) [in Russian], Naukova Dumka, Kiev (1966), p. 228.
2. M. Ross, Laser Receivers [Russian translation], Mir, Moscow (1969).
3. L. K. Anderson, Microwaves,4, 42 (1965).
4. Monocrystalline Films (Collected Papers) [Russian translation], Mir, Moscow (1966).
5. G. V. Rozenberg, The Optics of Thin Films [in Russian], Fizmatgiz, Moscow (1958).