1. (1) X. Zhu, J. Zhu, S. Zhou, Z. Liu, N. Ming, S. Lu, H. L.-W. Chan, and C.-L. Choy : “Recent progress of (Ba,Sr)TiO3 thin films for tunable microwave devices”, J. Electron. Mater., Vol. 32, No. 10, pp. 1125-1134 (2003)
2. (2) P. Bao, T. J. Jackson, X. Wang, and M. J. Lancaster : “Barium strontium titanate thin film varactors for room-temperature microwave device applications”, J. Phys. D. Appl. Phys., Vol. 41, No. 6, p. 063001 (2008)
3. (3) G. Subramanyam, M. W. Cole, N. X. Sun, T. S. Kalkur, N. M. Sbrockey, G. S. Tompa, X. Guo, C. Chen, S. P. Alpay, G. a. Rossetti, K. Dayal, L.-Q. Chen, and D. G. Schlom : “Challenges and opportunities for multi-functional oxide thin films for voltage tunable radio frequency/microwave components”, J. Appl. Phys., Vol. 114, No. 19, p. 191301 (2013)
4. (4) S. Hong, H. Bak, I. An, and O. K. Kim : “Microstructural and electrical properties of BaxSr1-xTiO3 thin films on various electrodes”, J. Appl. Phys., Vol. 39, No. 4A, pp. 1796-1800 (2000)
5. (5) N. Moriwaki, I. P. Koutsaroff, M. Kadota, M. Esashi, and S. Tanaka : “Integration process of variable capacitors using barium strontium titanate thin film deposited at high temperature”, IEICE Trans. Fundamentals (Japanese Edition), Vol. 96, No. 6, pp. 342-350 (2013) (in Japanese)