1. H. A. Sauer and S. S. Flaschen, Proc, 7th Electronic Components Symp., Washington D.C. Engineering Publishers, New York, pp 41–46, 1956.
2. Electrical Properties of BaTiO3Containing Samarium
3. Investigation of Rare-Earth Doped Barium Titanate
4. Properties of Semiconductive Barium Titanates