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Valuable discussions with Dr. B. Velický are cordially acknowledged.
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Závětová, M., Koc, S. & Zemek, J. Steep vs. exponential absorption edge in amorphous germanium: Evidence for the efefct of oxygen. Czech J Phys 22, 429–431 (1972). https://doi.org/10.1007/BF01690706
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DOI: https://doi.org/10.1007/BF01690706