Exponential-type distribution of human muscle sympathetic nerve activity results in an automatic quantification method. - Patrick Celka; Rolf Vetter; Jean-Marc Vesin; Etienne Pruvot; Urs Scherrer (Comput. Biol. Medicine, 1998)

Observer of the human cardiac sympathetic nerve activity using noncausal blind source separation. - Rolf Vetter; Jean-Marc Vesin; Patrick Celka; Urs Scherrer (IEEE Trans. Biomed. Eng., 1999)

Observer of autonomic cardiac outflow based on blind source separation of ECG parameters. - Rolf Vetter; Nathalie Virag; Jean-Marc Vesin; Patrick Celka; Urs Scherrer (IEEE Trans. Biomed. Eng., 2000)