1. Current situation and prospect of medical sensor;Chen;J. Xi’an Univ. Posts Telecommun.,2011
2. The configuration and principle of a kind of multifunctional electronic stethoscope;Wu;J. Southwest Univ. Sci. Technol.,2003
3. The comparative study of normal and abnormal heart sound signals;Zhao;Chin. J. Med. Phys.,2000
4. Time-frequency transforms: A new approach to first heart sound frequency dynamics;John;IEEE Trans. Biomed. Eng.,1992
5. The invention and evolution of the stethoscope;Hong;Chin. J. Med. Hist.,2010