@article{TMF_2000_122_2_a3,
     author = {R. K. Bullough and N. M. Bogolyubov and R. R. Puri},
     title = {Quantum integrability and quantum chaos in the micromaser},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {182--204},
     publisher = {mathdoc},
     volume = {122},
     number = {2},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2000_122_2_a3/}
}