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A. Belous
Department of Solid State Chemistry, V.I.Vernadskii Institute of General and Inorganic Chemistry of National Academy of Sciences of Ukraine, Kyiv-142, 03680, Ukraine
O. Ovchar
Department of Solid State Chemistry, V.I.Vernadskii Institute of General and Inorganic Chemistry of National Academy of Sciences of Ukraine, Kyiv-142, 03680, Ukraine