1. Massey, G.A., Loehr, T.M., Willis, L.J., Johnson, J.C.: Appl. Opt. 19 (1980) 4136.
2. Garmash, V.M., Govorun, D.N., Korotkov, P.A., Obukhovskii, V.V., Pavlova, N.I., Rez, I.S.: Opt. Spektrosk. 58 (1985) 699; Opt. Spectrosc. (English Transl.) 58 (1985) 424.
3. Karaseva, L.G., Andreev, B.V., Gromov, V.V., Zakharkin, B.N., Pavlova, N.I.: Dokl. Akad. Nauk, SSSR 289 (1986) 1152; Dokl. Phys. Chem. (English Transl.) 289 (1986) 707.
4. Lemeshko, V.V., Obukhovskii, V.V., Stoyanov, A.V., Pavlova, N.I., Pisanskii, A.I., Korotkov, P.A.: Ukrain. Fiz. Zh. Russ. Ed. 31 (1986) 1746.
5. Yang, H.G., Gu, B.Y., Wang, Y.Y., Huang, C.E., Shen, D.H.: Acta Opt. Sin. 6 (1986) 1071.