@article{DAN_1962_142_4_a17,
     author = {B. M. Shain},
     title = {Representation of semigroups by binary relations},
     journal = {Doklady Akademii Nauk},
     pages = {808--811},
     publisher = {mathdoc},
     volume = {142},
     number = {4},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_142_4_a17/}
}