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\bibitem{vanHeurck_etal1992} {\textquotedblleft}\textit{The modulated structure in the melilite CA2ZnGe2O7}{\textquotedblright}. van Heurck C, Van Tendeloo G, Amelinckx S, Physics and chemistry of minerals \textbf{8}, 441 (1992).   http://doi.org/10.1007/BF00200967

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