Geodesic
Quantum inverse problem method.~I
Teoretičeskaâ i matematičeskaâ fizika, Tome 40 (1979) no. 2, pp. 194-220

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A quantum-mechanical variant of the inverse problem method is proposed. For the quantum sine-Gordon model, an exact solution and quantum analogs of action-angle variables are obtained. The connection between the proposed method and Bethe's formulation is discussed, and also renormalization problems. 
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     author = {E. K. Sklyanin and L. A. Takhtadzhyan and L. D. Faddeev},
     title = {Quantum inverse problem {method.~I}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     publisher = {mathdoc},
     volume = {40},
     number = {2},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1979_40_2_a3/}
}
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E. K. Sklyanin; L. A. Takhtadzhyan; L. D. Faddeev. Quantum inverse problem method.~I. Teoretičeskaâ i matematičeskaâ fizika, Tome 40 (1979) no. 2, pp. 194-220. http://geodesic.mathdoc.fr/item/TMF_1979_40_2_a3/