Geodesic
Some properties of the Lee model.~I
Teoretičeskaâ i matematičeskaâ fizika, Tome 8 (1971) no. 3, pp. 308-323

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A study is made of Lee's quantum-field model with the Hamiltonian introduced in [2]. The explicit dependence of the resolvent on the $\tau$ matrices is found and it is shown that the expansion of the resolvent in a series in normal products reduces to the inversion of a certain operator that depends on the Bose operators. The formula obtained can be used to give qualitative information about the spectrum of the Hamiltonian. 
@article{TMF_1971_8_3_a1,
     author = {L. A. Dadashev},
     title = {Some properties of the {Lee} {model.~I}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {308--323},
     publisher = {mathdoc},
     volume = {8},
     number = {3},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1971_8_3_a1/}
}
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L. A. Dadashev. Some properties of the Lee model.~I. Teoretičeskaâ i matematičeskaâ fizika, Tome 8 (1971) no. 3, pp. 308-323. http://geodesic.mathdoc.fr/item/TMF_1971_8_3_a1/