@article{SEMR_2007_4_a3,
     author = {O. V. Grigorenko and V. A. Roman'kov},
     title = {On existence of the universal rational structures for groups},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {52--63},
     publisher = {mathdoc},
     volume = {4},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2007_4_a3/}
}