1. M. Trojan, Z. Šolc and M. Novotný, Pigments, Kirk-Othmer Encyclopedia of Chem. Technol., 19 (1996) 45, J. Wiley and Sons Inc., New York.
2. Z. C. Li and B. Bergman, J. Eur. Ceram. Soc., 25 (2005) 441.
3. http://www.galeries.com/minerals/oxides/perovski/perovski.html .
4. L. Q. Jiang, J. K. Guo, H. B. Liu, M. Zhu, X. Zhou, P. Wu and C. H. Li, J. Phys. Chem. Solids, 67 (2006) 1531.
5. F. S. Galasso, Perovskites and High Tc Superconductors, Gongor&Breach Science Publisher, New York 1990.