@conference {2144, title = {Increased Instability of Heartbeat Dynamics in Parkinson{\textquoteright}s Disease}, booktitle = {Computers in Cardiology}, year = {2013}, keywords = {Bioengineering}, author = {R. Barbieri and L. Citi and G. Valenza and M. Guerrisi and S. Orsolini and C. Tessa and S. Diciotti and N. Toschi} }