@article{DAN_1960_135_5_a9,
     author = {I. S. Ponizovskii},
     title = {On homomorphisms of commutative semigroups},
     journal = {Doklady Akademii Nauk},
     pages = {1058--1060},
     publisher = {mathdoc},
     volume = {135},
     number = {5},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_135_5_a9/}
}