@article{DAN_1962_144_2_a2,
     author = {V. A. Emelichev},
     title = {The solution of certain algorithmic problems for commutative semigroups},
     journal = {Doklady Akademii Nauk},
     pages = {261--263},
     publisher = {mathdoc},
     volume = {144},
     number = {2},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_144_2_a2/}
}