@article{DAN_1967_173_1_a13,
     author = {V. A. Shurygin},
     title = {Constructive sets with equality and their mappings},
     journal = {Doklady Akademii Nauk},
     pages = {54--57},
     publisher = {mathdoc},
     volume = {173},
     number = {1},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_173_1_a13/}
}