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Lengfellner, Hans and Hummel, J. and Netter, H. and Renk, Karl Friedrich (1983) Temperature dependence of the Ebar-]2abar far-infrared absorption line of excited chromium ions in ruby. Optics Letters 8 (4), pp. 220-222.
Lengfellner, Hans and Werling, U. and Hummel, J. and Netter, H. and Retzer, N. and Renk, Karl Friedrich (1981) Concentration dependence of the Ebar-]2abar far-infrared transition of excited chromium ions in ruby. Solid State Communications 38 (12), pp. 1215-1217.