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Praseodymium is used as an alloying constituent for alloys used to make permanent magnets and flints. Along with neodymium, praseodymium is used to manufacture yellow glass which can be used as eye protection (e.g. for welders).
Randell L Mills.; Jinquan Dong.; Ying Lu. Observation of extreme ultraviolet hydrogen emission from incandescently heated hydrogen gas with certain catalysts. Int. J. Hydrogen Energy. 2000, 25 (10),919-943.