[1] Η. Graener, A. Lanberean; Opt. Commun., 1981, 37, No. 2, 138.
[2] D. Von Ddr Linde et al., Opt. Commun., 1973, 8, No. 1, 91.
[1] Η. Graener, A. Lanberean; Opt. Commun., 1981, 37, No. 2, 138.
[2] D. Von Ddr Linde et al., Opt. Commun., 1973, 8, No. 1, 91.
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