Unsupervised detection and classification of heartbeats using the dissimilarity matrix in PCG signals. - Juan De La Torre Cruz; Damián Martínez-Muñoz; Nicolás Ruiz-Reyes; Antonio Jesús Muñoz-Montoro; Miguel Puentes-Chiachio; Francisco J. Cañadas-Quesada (Comput. Methods Programs Biomed., 2022)