%0 Journal Article %J Frontiers in Neuroengineering %D 2012 %T Dominant Lyapunov exponent and approximate entropy in heart rate variability during emotional visual elicitation %A G. Valenza %A Allegrini, P. %A A Lanata %A E. P. Scilingo %K Bioengineering %B Frontiers in Neuroengineering %V 5 %G eng