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Refinement of some Na~0.5{-~<i>x</i>}<i>M</i>'~0.5+<i>x~/3</i>\\square ~2<i>x~/3</i>MoO~4~, <i>M</i>' = Bi, Ce, La, scheelite structures with powder neutron and X-ray diffraction data, Acta Crystallographica Section C 48, 2101 (1992)