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\bibitem{Stefan_etal1999} {\textquotedblleft}\textit{Growth of pure and doped Rb$_{2}$ZnCl$_{4}$and K$_{2}$ZnCl$_{4}$ single crystals by Czochralski technique}{\textquotedblright}. Stefan M, Nistor SV, Mateescu DC, Abakumov AM, Journal of crystal growth \textbf{200}, 148 (1999).   http://doi.org/10.1016/S0022-0248(98)01247-0

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