@article{TMF_1990_82_1_a4,
     author = {I. Ya. Aref'eva and P. B. Medvedev},
     title = {Oscillator representation of~picture-changing operators},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {34--46},
     publisher = {mathdoc},
     volume = {82},
     number = {1},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1990_82_1_a4/}
}