@article{SEMR_2017_14_a76,
     author = {N. A. Gaydamakin and V. A. Baransky},
     title = {Algebra of multirubric on root trees of hierarchical thematic classifiers},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {1030--1040},
     publisher = {mathdoc},
     volume = {14},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2017_14_a76/}
}