@article{DAN_1973_212_2_a6,
     author = {N. N. Nepeivoda},
     title = {A certain generalization of the {Kleene--Mostowski} hierarchy},
     journal = {Doklady Akademii Nauk},
     pages = {295--297},
     publisher = {mathdoc},
     volume = {212},
     number = {2},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_212_2_a6/}
}