@article{TMF_1991_89_3_a9,
     author = {A. S. Shumovskii},
     title = {Bogolyubov canonical transformation and collective states of bosonic fields},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {438--445},
     publisher = {mathdoc},
     volume = {89},
     number = {3},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1991_89_3_a9/}
}