Geodesic
Bogolyubov transformation in terms of creation and annihilation operators
Teoretičeskaâ i matematičeskaâ fizika, Tome 54 (1983) no. 3, pp. 464-468

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A Bogolyubov transformation that separates the classical component of a boson field is realized directly in terms of creation and annihilation operators, which makes it possible to extend the applicability of the method. 
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     author = {O. D. Timofeevskaya},
     title = {Bogolyubov transformation in terms of creation and annihilation operators},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {464--468},
     publisher = {mathdoc},
     volume = {54},
     number = {3},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1983_54_3_a14/}
}
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O. D. Timofeevskaya. Bogolyubov transformation in terms of creation and annihilation operators. Teoretičeskaâ i matematičeskaâ fizika, Tome 54 (1983) no. 3, pp. 464-468. http://geodesic.mathdoc.fr/item/TMF_1983_54_3_a14/