@article{MZM_1996_59_3_a6,
     author = {Yu. F. Korobeinik},
     title = {On~the countable definability of sets},
     journal = {Matemati\v{c}eskie zametki},
     pages = {382--395},
     publisher = {mathdoc},
     volume = {59},
     number = {3},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1996_59_3_a6/}
}