Chaining spins from (super)Yang--Mills
  We review the spin bit model describing anomalous dimensions of the operators of Super Yang--Mills theory. We concentrate here on the scalar sector. In the limit of large $N$ this model coincides with integrable spin chain while at finite N it has nontrivial chain splitting and joining interaction. 
S. Bellucci, P.Y. Casteill, J.F. Morales, C. Sochichiu