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Blak, A.R., Isotani, S. & Watanabe, S. Optical absorption and electron spin resonance in blue and green natural beryl: A reply . Phys Chem Minerals 9, 279–280 (1983). https://doi.org/10.1007/BF00309581
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DOI: https://doi.org/10.1007/BF00309581