@article{AL_1974_13_4_a2,
     author = {E. B. Kinber},
     title = {Frequency enumeration of sets},
     journal = {Algebra i logika},
     pages = {398--419},
     publisher = {mathdoc},
     volume = {13},
     number = {4},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1974_13_4_a2/}
}