%0 Journal Article
%A A. A. Fridman
%T Degrees of unsolvability of the word problem for finitely presented groups
%J Doklady Akademii Nauk
%D 1962
%P 805-808
%V 147
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1962_147_4_a15/
%G ru
%F DAN_1962_147_4_a15