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@article{AL_1991_30_6_a5, author = {V. L. Selivanov}, title = {The fine hierarchy and definable index sets}, journal = {Algebra i logika}, pages = {705--725}, publisher = {mathdoc}, volume = {30}, number = {6}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1991_30_6_a5/} }
V. L. Selivanov. The fine hierarchy and definable index sets. Algebra i logika, Tome 30 (1991) no. 6, pp. 705-725. http://geodesic.mathdoc.fr/item/AL_1991_30_6_a5/