%0 Journal Article
%A Yu. L. Ershov
%T Hereditarily effective operations
%J Algebra i logika
%D 1976
%P 642-654
%V 15
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AL_1976_15_6_a3/
%G ru
%F AL_1976_15_6_a3