@article{MZM_1990_48_6_a11,
     author = {R. I. Tyshkevich and A. A. Chernyak},
     title = {Yet another method of enumerating unmarked combinatorial objects},
     journal = {Matemati\v{c}eskie zametki},
     pages = {98--105},
     publisher = {mathdoc},
     volume = {48},
     number = {6},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1990_48_6_a11/}
}