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2. Optical Excitation and Decay Processes in Rare Gas Solids, in: Proc. Internat. Summer School on Synchrotron Radiation Research, Vol. 1, Ed. and , Alghero 1976 (p. 453).
3. Sharp Optical Spectra of Impurities in Metals
4. Observation of Surface Excitons in Rare-Gas Solids
5. private communication.