@article{TMF_1989_81_3_a1,
     author = {A. N. Vasil'ev},
     title = {Combinatorics of~the $R$ operation},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {336--353},
     publisher = {mathdoc},
     volume = {81},
     number = {3},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1989_81_3_a1/}
}