@article{SF_1975__10_134112,
     author = {V. Trnkova},
     title = {On representation of commutative semigroups.},
     journal = {Semigroup forum},
     pages = {203--214},
     publisher = {mathdoc},
     volume = {10},
     year = {1975},
     zbl = {0299.20056},
     url = {http://geodesic.mathdoc.fr/item/SF_1975__10_134112/}
}