1. G.R. Moe, W.C. Reinboldt, J.A. Abildskov: Am. Heart J. 67, 200 (1964)
2. J.M. Smith, R.J. Cohen: Proc. Natl. Acad. Sci. USA. 81, 233 (1984)
3. A.L. Goldberger, B.J. West, V. Bhargava: In Proc. 11th IMACS World Congress Oslo, Norway, ed. by B. Walstrom, R. Henriksen, N.P. Sundby, Vol.2 (North-Holland Publishing Company 1985). p.239
4. A.L. Goldberger, V. Bhargava, B.J. West, A.J. Mandell. Physica 19D, 282 (1986)
5. A.L. Goldberger, B.J. West: Ann. N.Y. Acad. Sci. In press.