Morphologically constrained signal subspace characterization of electrograms during ventricular fibrillation. - Krishnanand Balasundaram; Stéphane Massé; Talha Farid; Krishnakumar Nair; John Asta; Robert J. Cusimano; Edward J. Vigmond; Kumaraswamy Nanthakumar; Karthikeyan Umapathy (Biomed. Signal Process. Control., 2017)