1. Government STandard 15093-69: “Lasers. Parameters. Terminology and Definition.”
2. S. G. Slavnov, Metrologiya i Izmeritel'naya Tekhnika (Ref. Zh.), Izd. VNIIKI, No. 8 (1972).
3. V. P. Linnik et al., OMP, No. 11 (1971).
4. T. M. Miyamoto and K. Yashura, Appl. Optics, No. 10 (1971).
5. N. N. Vasil'eva and A. P. Ovechkin, Izmeritel'. Tekh., No. 5 (1971).