G.  Valenza, Orsolini, S., Diciotti, S., Citi, L., Scilingo, E. P., Guerrisi, M., Danti, S., Lucetti, C., Tessa, C., and Barbieri, R., ?Assessment of spontaneous cardiovascular oscillations in Parkinson's disease?, Biomedical Signal Processing and Control, vol. 26, pp. 80?89, 2016. 

G.  Valenza, Citi, L., Scilingo, E. P., and Barbieri, R., ?Assessment of Dynamic Autonomic Changes with Posture using Instantaneous Entropy Measures?, in Computers in Cardiology, Cambridge (MA, USA), 2014, vol.  41, pp. 489-492.