@article{DAN_1993_329_2_a2,
     author = {Yu. M. Voloshin},
     title = {{\textquotedblleft}Up-down{\textquotedblright} sequences and ordered trees},
     journal = {Doklady Akademii Nauk},
     pages = {125--127},
     year = {1993},
     volume = {329},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1993_329_2_a2/}
}