@article{MZM_2019_105_5_a4,
     author = {V. G. Kanovei and V. A. Lyubetskii},
     title = {Definable {Elements} of {Definable} {Borel} {Sets}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {696--707},
     publisher = {mathdoc},
     volume = {105},
     number = {5},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2019_105_5_a4/}
}