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Yamazaki, M., Kojima, K. Up-conversion fluorescence and electron spin resonance in Er3+-doped GeO2 heated gel prepared via a sol-gel process. J Mater Sci Lett 14, 813–815 (1995). https://doi.org/10.1007/BF00278138
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DOI: https://doi.org/10.1007/BF00278138