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Nikolova, E.G., Gospodinov, M.M. The Twyman effect in crystals of Bi4Ge3O12 and Bi12SiO20 . J Mater Sci Lett 8, 309–310 (1989). https://doi.org/10.1007/BF00725508
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DOI: https://doi.org/10.1007/BF00725508