Dongyu Zhang Lei Zhang David Zhang Yongping Zheng Wavelet Based Analysis of Doppler Ultrasonic Wrist-pulse Signals. 539-543 2008 BMEI (2) http://doi.ieeecomputersociety.org/10.1109/BMEI.2008.326 conf/bmei/2008-2 db/conf/bmei/bmei2008-2.html#ZhangZZZ08