Quantization in the neighborhood of a~classical solution in a~nonlinear $O(3)$-invariant theory
Teoretičeskaâ i matematičeskaâ fizika, Tome 37 (1978) no. 3, pp. 326-335

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In the framework of perturbation theory in inverse powers of the coupling constant, a Bogolyubov transformation is used to quantize an essentially nonlinear field that interacts nonlinearly with a fixed source.
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     author = {O. D. Timofeevskaya},
     title = {Quantization in the neighborhood of a~classical solution in a~nonlinear $O(3)$-invariant theory},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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O. D. Timofeevskaya. Quantization in the neighborhood of a~classical solution in a~nonlinear $O(3)$-invariant theory. Teoretičeskaâ i matematičeskaâ fizika, Tome 37 (1978) no. 3, pp. 326-335. http://geodesic.mathdoc.fr/item/TMF_1978_37_3_a3/