%0 Journal Article
%T Yuri\u{\i} Leonidovich Ershov (on the occasion of his fiftieth               birthday)
%J Algebra i logika
%D 1990
%P 135-138
%V 29
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AL_1990_29_2_a0/
%G ru
%F AL_1990_29_2_a0