Dynamical correlation functions of the XXZ spin-1/2 chain
  We derive a master equation for the dynamical spin-spin correlation functions of the XXZ spin-1/2 Heisenberg finite chain in an external magnetic field. In the thermodynamic limit, we obtain their multiple integral representation. 
N. Kitanine, J. M. Maillet, N. A. Slavnov, V. Terras