@article{TMF_1975_22_1_a1,
     author = {I. G. Brankov and V. A. Zagrebnov and N. S. Tonchev},
     title = {Asymptotically exact solution of the generalized {Dicke} model},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {20--30},
     publisher = {mathdoc},
     volume = {22},
     number = {1},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1975_22_1_a1/}
}