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Van Heurck, C., Van Tendeloo, G. & Amelinckx, S. The modulated structure in the melilite Ca2ZnGe2O7 . Phys Chem Minerals 18, 441–452 (1992). https://doi.org/10.1007/BF00200967
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DOI: https://doi.org/10.1007/BF00200967