@article{MT_1989_12_a8,
     author = {V. L. Selivanov},
     title = {Fine hierarchies of arithmetic sets, and definable index sets},
     journal = {Matemati\v{c}eskie trudy},
     pages = {165--185},
     publisher = {mathdoc},
     volume = {12},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_1989_12_a8/}
}