@article{DAN_1983_273_4_a10,
     author = {V. E. Kuznetsov},
     title = {$K$-systems},
     journal = {Doklady Akademii Nauk},
     pages = {815--816},
     publisher = {mathdoc},
     volume = {273},
     number = {4},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1983_273_4_a10/}
}