%0 Conference Paper %B 2012 Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC) %D 2012 %T Instantaneous estimation of high-order nonlinear heartbeat dynamics by Lyapunov exponents %A L. Citi %A G. Valenza %A R. Barbieri %K Bioengineering %B 2012 Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC) %I IEEE %P 13–16 %G eng