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Mikhail, Patric; Basler, Reto; Hulliger, Jürg (1999). Czochralski growth and spectroscopic investigations of Yb3+, La3+:Na2SO4(I) and Nd3+:Na2SO4(I). Journal of materials research, 14(10), pp. 4093-4097. Cambridge University Press 10.1557/JMR.1999.0552