Monodromy Map and Classical r-matrices
  We compute the Poisson bracket relations for the monodromy matrix of the auxiliary linear problem. If the basic Poisson bracket relations of the model contain derivatives, this computation leads to a peculiar type of symmetry breaking which accounts for a 'spontaneous quantization of the underlying global gauge group. A classification of possible patterns of symmetry breaking is outlined. 
M. A. Semenov-Tian-Shansky