@article{MZM_1987_41_1_a11,
     author = {L. M. Koganov},
     title = {An oriented graph connected with an ordered pair of ordered partitions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {101--103},
     publisher = {mathdoc},
     volume = {41},
     number = {1},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1987_41_1_a11/}
}