WASET
Kakuta, H. , Watanabe, K. , Kurihara, Y.. "Development of Vibration Sensor with Wide Frequency Range Based on Condenser Microphone -Estimation System for Flow Rate in Water Pipes-". World Academy of Science, Engineering and Technology, Open Science Index 70, International Journal of Mechanical and Mechatronics Engineering, (2012), 6(10), 2267 - 2272.