1. N. Chubachi and T. Sannomiya, Composite Resonators Using PVDF Film and its Application to Concave Transducers for Focusing Radiation of VHF Ultrasonic Waves, 1977 IEEE Ultrasonic Symposium, p. 119.
2. H. Ohigashi, Ultrasonic Transducer in the MHz Range, in “Applications of Ferroelectric Polymers“, T. T. Wang, J. M. Herbert, and A. M. Glass, eds., Blackies, Glasgow (1987).
3. K. Koga and H. Ohigashi, Piezoelectricity and Related Properties of Vinylidene Fluoride and Trifluoroethylene Copolymers, J. Appl. Phys. 59:2142 (1986).
4. R. Omoto, M. Maruyama, M. Kobayashi, H. Ohigashi, T. Nakanishi, and M. Suzuki, Piezoelectric Polymer Trasnsducers for High Resolution Ultrasound Imaging, Proceedings of the 26th Annual Meeting of the American Institute of Ultrasound in Medicine (1981, San Francisco) p.135
5. H. Ohigashi, K. Koga, M. Suzuki, T. Nakanishi, K. Kimura, N. Hashimoto, Piezoelectric and Ferroelectric Properties of P(VDF-TrFE) Copolymers and Their Applications to Ultrasonic Transucers, Ferroelectrics, 60:263 (1984).