[2] Ρ. N. Puntambobar et al.; Opt. Commun., 1982, 41, 191.
[3] Ε. Κ. Hasle; Opt. Commun.; 1979, 31, 206.
[4] R. A. J. Keijser; Opt. Commun., 1977, 23. 194.
[2] Ρ. N. Puntambobar et al.; Opt. Commun., 1982, 41, 191.
[3] Ε. Κ. Hasle; Opt. Commun.; 1979, 31, 206.
[4] R. A. J. Keijser; Opt. Commun., 1977, 23. 194.
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