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(4) M. Fukuda, M. Uchida: “A Basic Caracteristic for Presentation of 3-D Position Information using PZT Vibrator”, IEEJ Trans, Vol. 119-C, No. 7, pp. 915-916 (1999-7) (in Japanese)
福田真樹·内田雅文:「PZT振動子を用いた3次元位置情報呈示のための基礎特性」, 電学論C, 119, 7, pp. 915-916 (1999-7)