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Genzel, L. and Prettl, Wilhelm and Siep, E. (1969) Impurity induced far infrared absorption of CsI crystals. Optics Communications 1 (1), pp. 28-30.
Busse, G. and Prettl, Wilhelm and Genzel, L. (1968) Stress dependent frequency shift of the resonant bandmode in NaCl:Cu+. Physics Letters A 27 (7), pp. 438-440.
Prettl, Wilhelm and Genzel, L. (1966) Notes on the submillimeter laser emission from cyanic compounds. Physics Letters 23 (7), pp. 443-444.