@article{VNGU_2018_18_2_a3,
     author = {M. V. Dorzhieva},
     title = {Friedberg numbering of the family of {All} $\Sigma^{1}_{2}$-sets},
     journal = {Sibirskij \v{z}urnal \v{c}istoj i prikladnoj matematiki},
     pages = {47--52},
     year = {2018},
     volume = {18},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VNGU_2018_18_2_a3/}
}