%0 Journal Article %A M. I. Kanovich %T Complexity of the decidability of an enumerable set as a criterion of its universality %J Doklady Akademii Nauk %D 1970 %P 500-503 %V 194 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1970_194_3_a4/ %G ru %F DAN_1970_194_3_a4