Su Z.-Y.Wang C.-C.Wu T.Wang Y.-T.Tang F.-C.2019-07-032019-07-0320083784371https://www.scopus.com/inward/record.uri?eid=2-s2.0-36448974920&doi=10.1016%2fj.physa.2007.09.013&partnerID=40&md5=5ca3f122fb20fce1b12a7697e6db4748https://scholars.lib.ntu.edu.tw/handle/123456789/412645Instantaneous frequency-time analysis of physiology signals: The application of pregnant women's radial artery pulse signalsjournal article10.1016/j.physa.2007.09.0132-s2.0-36448974920