Citation: Benabbas, A.; Borel, M.; Grandin, A.; Leclaire, A.; Raveau, B. (1991). Na2+x Nb6 P4 O26 : a novel niobium phosphate bronze isotypic of the m=3 member of the MPTBp family _cod_database_code 1001698. Journal of Solid State Chemistry, 95, pp. 245-252.