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Supported in part by the Air Research and Development Command U.S. Air Force, through its European Office.
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Low, W. Optical spectra of Eu2+ and Gd3+ in CaF2 . Nuovo Cim 17, 607–608 (1960). https://doi.org/10.1007/BF02860415
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DOI: https://doi.org/10.1007/BF02860415