"W. Zhang,N. Kumada,Y. Yonesaki,T. Takei,N. Kinomura,T. Hayashi,M. Azuma,M. Takano","Ferroelectric perovskite-type barium copper niobate: BaCu1/3Nb2/3O3",,"Solid State Chem.",,"Vol. 179",,"pp. 4052-4055",2006,