@article{CTT100546417,
  author = {Kentaro Kasuga and Hiroyuki Hachiya and Takeo Kinosita},
  title = {Quantitative Estimation of the Ultrasound Transmission Characteristics for River Flow Measurement during a Flood},
  journal = {Jpn. J. Appl. Phys.},
  year = 2003,
}

@inproceedings{CTT100590224,
  author = {蜂屋弘之 and 春日健太郎 and 木下武雄},
  title = {河川における音波伝搬の変動要因の検討 : 超音波流速計の洪水観測への応用},
  booktitle = {信学技報},
  year = 2001,
}