%0 Conference Paper %B Computers in Cardiology %D 2013 %T Increased Instability of Heartbeat Dynamics in Parkinson's Disease %A R. Barbieri %A L. Citi %A G. Valenza %A M. Guerrisi %A S. Orsolini %A C. Tessa %A S. Diciotti %A N. Toschi %K Bioengineering %B Computers in Cardiology