Geodesic
The~form factor program: A~review and new results, the~nested
Teoretičeskaâ i matematičeskaâ fizika, Tome 155 (2008) no. 1, pp. 13-24

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The purpose of the "bootstrap program" for integrable quantum field theories in $1{+}1$ dimensions is to construct a model explicitly in terms of its Wightman functions. We illustrate this program here mainly in terms of the $SU(N)$ Gross–Neveu model. We construct the nested off-shell Bethe ansatz for an $SU(N)$ factoring $S$-matrix and consider the problem of how to sum over intermediate states in the short-distance limit of the two-point Wightman function for the sinh-Gordon model.
Keywords: integrable quantum field theory, form factor. 
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H. M. Babujian; A. Foerster; M. Karowski. The~form factor program: A~review and new results, the~nested. Teoretičeskaâ i matematičeskaâ fizika, Tome 155 (2008) no. 1, pp. 13-24. http://geodesic.mathdoc.fr/item/TMF_2008_155_1_a1/