%0 Journal Article %A L. A. Bokut' %T Unsolvability of certain algorithmic problems in a class of %J Algebra i logika %D 1970 %P 137-144 %V 9 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/AL_1970_9_2_a1/ %G ru %F AL_1970_9_2_a1