@article{VNGU_2011_11_2_a7,
     author = {S. S. Ospichev},
     title = {Infinite family of~$\Sigma_a^{-1}${-Sets} with only {One} {Computable} {Numbering}},
     journal = {Sibirskij \v{z}urnal \v{c}istoj i prikladnoj matematiki},
     pages = {89--92},
     publisher = {mathdoc},
     volume = {11},
     number = {2},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VNGU_2011_11_2_a7/}
}