@article{SEMR_2010_7_a6,
     author = {Yu. L. Ershov},
     title = {Topological objects in category $EQU$},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {76--86},
     publisher = {mathdoc},
     volume = {7},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2010_7_a6/}
}