@article{CTT100424523,
  author = {M. K. Kurosawa and O. Kodaira and Y. Tsuchitoi and T. Higuchi},
  title = {Transducer For High Speed and Large Thrust Ultrasonic Linear Motor Using Two Sandwich Type Vibrator},
  journal = {IEEE  Trans. Ultrasonics, Ferroelectrics and Frequency Control},
  year = 1998,
}