Hironori Kakuta and  Kajiro Watanabe and  Yosuke Kurihara,  Development of Vibration Sensor with Wide Frequency Range Based on Condenser Microphone -Estimation System for Flow Rate in Water Pipes-.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2012, vol. 70(10). 2267 - 2272
    [viewed 08 May 2024]. Available from: https://publications.waset.org/pdf/8417.