1. S. G. Rautian, Usp. Fiz. Nauk,66, 475 (1958).
2. B. N. Grechushnikov, Opt. Spektrosk.,12, No. 1, 135 (1962).
3. B. N. Grechushnikov and V. F. Koryagin, Zh. Prikl. Spektrosk.,13, No. 3, 569 (1970).
4. V. G. Tyazhelova, Automation of Biological Investigations [in Russian], Nauka, Moscow (1968).
5. Anton Bartl, Z. Naturforsch.,23a, 1975 (1968).