2Nanchen D, Leening MJ, Locatelli I, etal. Resting heart rate and the risk of heart failure in healthy adults: the Rotterdam Study [J] . Circ Heart Fail, 2013, 6 (3) : 403-410.
3Roshan Joy Martis, U. Rajendra Acharya, Choo Min Lim et al. Characterization of ECG beats from cardiac arrhythmia u- sing discrete cosine transform in PCA framework [ J ]. Knowl- edge - based systems ,2013,45 (6) :76 - 82.