Form Factors in Completely Integrable Models of Quantum Field Theory

The monograph summarizes recent achievements in the calculation of matrix elements of local operators (form factors) for completely integrable models. In particular, it deals with sine-Gordon, chiral Gross-Neven and O(3) nonlinear s models. General requirements on form factors are formulated and explicit formulae for form factors of most fundamental local operators are presented for the above mentioned models.