1. 1/f fluctuation of heartbeat period;Kobayashi;IEEE Trans. Biomed. Eng.,1982
2. Fractal Physiology;Bassingthwaighte,1994
3. M. Malik, A.J. Camm (Eds.), Heart Rate Variability, Futura, Armonk, NY, 1995.
4. Introduction to Phase Transitions and Critical Phenomena;Stanley,1971
5. Scaling, universality, and renormalization;Stanley;Rev. Mod. Phys.,1999