@conference {2137, title = {Instantaneous bispectral characterization of the autonomic nervous system through a point-process nonlinear model}, booktitle = {World Congress on Medical Physics and Biomedical Engineering}, year = {2013}, pages = {530{\textendash}533}, publisher = {Springer Berlin Heidelberg}, organization = {Springer Berlin Heidelberg}, address = {May 26-31, 2012, Beijing, China}, keywords = {Bioengineering}, author = {G. Valenza and L. Citi and E. P. Scilingo and R. Barbieri} }