Bogolyubov transformation in the Lee model
Teoretičeskaâ i matematičeskaâ fizika, Tome 55 (1983) no. 2, pp. 205-215

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It is shown that the Lee model admits quantization about the single-particle classical solut!on. The state vector of the system is normalizable and has finite energy in the limit when the form factor $A(f)\to1$.
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     author = {V. G. Bornyakov and O. D. Timofeevskaya},
     title = {Bogolyubov transformation in the {Lee} model},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     publisher = {mathdoc},
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V. G. Bornyakov; O. D. Timofeevskaya. Bogolyubov transformation in the Lee model. Teoretičeskaâ i matematičeskaâ fizika, Tome 55 (1983) no. 2, pp. 205-215. http://geodesic.mathdoc.fr/item/TMF_1983_55_2_a4/