The Multisite Antiferromagnetic Ising Spin Model and Universality of   Feigenbaum Constants
  The Feigenbaum constants $\alpha$ and $\delta$ for the three-site antiferromagnetic Ising spin model on Husimi tree are calculated. It is shown that the numerical values of these constants for this real physical system coincide with the famous universal Feigenbaum constants with high accuracy. The quantitative description from ordering to chaos is also obtained. 
N.S.Ananikian, R.R.Lusiniants, K.A.Oganessyan (Yerevan Physics   Institute, Alikhanian Br.2, 375036, Yerevan, Armenia)