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Tanaka, K., Kamiya, K. Electron spin resonance and optical absorption spectra of chromium in silica gels and glasses prepared by the sol-gel method. J Mater Sci Lett 10, 1095–1097 (1991). https://doi.org/10.1007/BF00720136
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DOI: https://doi.org/10.1007/BF00720136