@article{SEMR_2015_12_a8,
     author = {D. V. Solomatin},
     title = {Planar varieties of semigroups},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {232--247},
     publisher = {mathdoc},
     volume = {12},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2015_12_a8/}
}