@article{CTT100654219,
  author = {N. Thong-un and S. Hirata and M. K. Kurosawa and Y. Orino},
  title = {Three-dimensional position and velocity measurements using a pair of linear-period-modulated ultrasonic waves},
  journal = {Acoustical Science and Technology (AST)},
  year = 2013,
}

@inproceedings{CTT100652077,
  author = {Natee Thong-un and Minoru Kuribayashi Kurosawa and Shinnosuke Hirata},
  title = {A simple method for 3-D ultrasonic position and velocity measurement using echolocation},
  booktitle = {日本音響学会 2013年春季研究発表会 講演論文集},
  year = 2013,
}