Geodesic
Canonical fields in the quantum sh-Gordon model
Zapiski Nauchnykh Seminarov POMI, Differential geometry, Lie groups and mechanics. Part 10, Tome 172 (1989), pp. 145-159 
I. M. Khamitov. Canonical fields in the quantum sh-Gordon model. Zapiski Nauchnykh Seminarov POMI, Differential geometry, Lie groups and mechanics. Part 10, Tome 172 (1989), pp. 145-159. http://geodesic.mathdoc.fr/item/ZNSL_1989_172_a13/
@article{ZNSL_1989_172_a13,
     author = {I. M. Khamitov},
     title = {Canonical fields in the quantum {sh-Gordon} model},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {145--159},
     year = {1989},
     volume = {172},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1989_172_a13/}
}
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

The fundamental canonical fields in the quantum sh-Gordon model are constructed by use of the Gelfand–Levitan–Marchenko equations.