%0 Journal Article %A Zh. T. Talasbaeva %T Positive Numberings of Families of Sets in the Ershov Hierarchy %J Algebra i logika %D 2003 %P 737-746 %V 42 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/AL_2003_42_6_a6/ %G ru %F AL_2003_42_6_a6