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References for Na <sub>5</sub> VO(PO <sub>4</sub> ) <sub>2</sub> F as a representative of the Na <sub>5</sub> <i>M</i> O <sub> 1− <i>x</i> </sub> (PO <sub>4</sub> ) <sub>2</sub> F <sub> 1+ <i>x</i> </sub> ( <i>M</i>  = Ti, V, Fe; <i>x</i>  = 0 or 1) family: synthesis, crystal structure and polytypism | ResearchHub - ResearchHub