1. V. S. Shumovich, G. V. Nebesnii, V. S. Komaristaya, et al., Developmental Tendencies of Foreign Gas-Analysis Aids. Review Information. Series TS-4, Moscow (1983), No. 6.
2. V. I. Butkevich and V. E. Privalov, Zh. Prikl. Spektrosk.,48, No. 1, 7?26 (1988).
3. G. Walter (ed.), Laser Spectroscopy of Atoms and Molecules [Russian translation], Moscow (1979).
4. V. I. Balykin, V. I. Bekov, V. S. Letokhov, et al., Usp. Fiz. Nauk,132, No. 2, 293?344 (1980).
5. N. Omenetto (ed.), Analytical Laser Spectroscopy [in Russian], Moscow (1982).