1. P. G. Kard, Opt. i Spektrosk.,6, 389 (1959).
2. P. W. Baumeister, F. A. Jenkins, and M. A. Jeppesen, J. Opt. Soc. Amer.,49, 1188 (1959).
3. Physics of Thin Films (G. Hass, editor), Vol. 1 [Russian translation], Mir, Moscow (1967), p. 101.
4. G. P. Konyukhov, E. A. Nesmelov, M. A. Validov, and I. S. Gainutdinov, Zh. Prikl. Spektroskopii,7, 711 (1967).
5. V. V. Sukhanovskii, Doctoral Dissertation [in Russian], Moskov. Gos. Univ. (1959).