Q. Yin, M. Ding, C. Tian, H. Lu, J. Cheng, and Y. Zhou, “Piezoelectric and Ferroelectric Properties of (Bi0.5Na0.5)0.9Ba0.07Sr0.03TiO3 Lead-Free Ceramics with MnO2 Doping”, ajc, vol. 24, no. 9, pp. 4095–4097, May 2012.