@article{DAN_1969_189_1_a3,
     author = {\`E. A. Golubov},
     title = {Finite separability in semigroups},
     journal = {Doklady Akademii Nauk},
     pages = {20--22},
     publisher = {mathdoc},
     volume = {189},
     number = {1},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_189_1_a3/}
}