%0 Journal Article %A V. G. Kanovei %T The set of all analytically definable sets of natural numbers can be defined analytically %J Izvestiya. Mathematics %D 1980 %P 469-500 %V 15 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM2_1980_15_3_a2/ %G en %F IM2_1980_15_3_a2