[1] W. Koechner; "So]id-State Laser Engineering", New York, Springer, 1976, p. 439.
[2] Β. B. McFarland; Nature, 1965, 207, 1180.
[1] W. Koechner; "So]id-State Laser Engineering", New York, Springer, 1976, p. 439.
[2] Β. B. McFarland; Nature, 1965, 207, 1180.
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