[1] V. Wilke, W. Schmidt; Appl. Phys., 1979, 18, 177~181.
[2] F. Ε. Anssenegg et al.; Opt. Commun., 1981, 37, No. 1, 59~66.
[3] R. Β. Andreev et al.; Opt. and Spectrosc., 1981, 51, No. 4, 358~361.
[1] V. Wilke, W. Schmidt; Appl. Phys., 1979, 18, 177~181.
[2] F. Ε. Anssenegg et al.; Opt. Commun., 1981, 37, No. 1, 59~66.
[3] R. Β. Andreev et al.; Opt. and Spectrosc., 1981, 51, No. 4, 358~361.
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