Reference
Single phase dielectric compounds in the BaO - rich corner of the BaO – Re2O3 – TiO2 ternary system (Re = Y, Nd, and Sm), Ang Chen, Yu Zhi, V. M. Ferreira, P. M. Vilarinho, J. L. Baptista, Journal of Materials Science Letters, 15, 1313-1314, 1996. (http://dx.doi.org/10.1007/BF00240791)