@article{AL_1994_33_6_a2,
     author = {A. N. Koryukin},
     title = {On noncommutative invariants of bialgebras},
     journal = {Algebra i logika},
     pages = {654--680},
     publisher = {mathdoc},
     volume = {33},
     number = {6},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1994_33_6_a2/}
}