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@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/} }
V. L. Selivanov. Fine hierarchies of arithmetic sets, and definable index sets. Matematičeskie trudy, Tome 12 (1989), pp. 165-185. http://geodesic.mathdoc.fr/item/MT_1989_12_a8/