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Title
Structure and Magnetic Properties of Pyridine Coordinated Sandwich-type Heteropolyanion {[Na(H<sub>2</sub>O)<sub>2</sub>]<sub>3</sub>[Ni(C<sub>5</sub>H<sub>5</sub>N)]<sub>3</sub>(AsW<sub>9</sub>O<sub>33</sub>)<sub>2</sub>}<sup>9−</sup>.