@article{DAN_1974_216_4_a4,
     author = {V. G. Kanovei},
     title = {On degrees of constructibility and descriptive properties of the set of real numbers in an initial model and in its extensions},
     journal = {Doklady Akademii Nauk},
     pages = {728--729},
     publisher = {mathdoc},
     volume = {216},
     number = {4},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1974_216_4_a4/}
}