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- [8] Fluorescence spectra of rare earth elements in artificial fluorides in their interpretation ZEITSCHRIFT FUR PHYSIK, 1939, 113 (1-2): : 96 - 114
- [9] INFRARED SPECTRA OF DOUBLE SULFATES OF RARE EARTH ELEMENTS WITH POTASSIUM ZHURNAL NEORGANICHESKOI KHIMII, 1971, 16 (05): : 1275 - &