On the evaluation of form factors and correlation functions for the   integrable spin-s XXZ chains via the fusion method
  Revising the derivation of the previous papers, for the integrable spin-$s$ XXZ chain we express any form factor in terms of a single sum over scalar products of the spin-1/2 XXZ chain. With the revised method we express the spin-$s$ XXZ correlation function of any given entry at zero temperature in terms of a single sum of multiple integrals. 
Tetsuo Deguchi and Chihiro Matsui
cond-mat.stat-mech hep-th math-ph math.MP