%0 Journal Article %A V. A. Emelichev %T The solution of certain algorithmic problems for commutative semigroups %J Doklady Akademii Nauk %D 1962 %P 261-263 %V 144 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1962_144_2_a2/ %G ru %F DAN_1962_144_2_a2