Bibliografia
Devaney, R. A first course in chaotic dynamical systems theory and experiments. Reading Mass.: Addison- Wesley, New York 1992;1-48. 

Huikuri, H.V., Makikallio, T.H., Peng, Ch, Goldberger, A.L., Hintze, U., Moller, M. 2000. Fractal correlation properties of R-R interval dynamics and mortality in patients with depressed left ventricular function after an acute myocardial infartion. Circulation; 101:47-53. 

Juha, S. Perkio, Ma Ki, Timo H. Ma Kikallio, Heikki Huikuri. 2005. Fractal and Complexity Measures of Heart Rate Variability. Clinical and Experimental Hypertension, 2 & 3:149- 158.