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Al-Ani, S.K.J., Hogarth, C.A. & Ilyas, M. The optical absorption edge in thin amorphous oxide films based on germania. J Mater Sci Lett 3, 391–394 (1984). https://doi.org/10.1007/BF00724375
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DOI: https://doi.org/10.1007/BF00724375