@article{IVM_1974_9_a3,
     author = {V. S. Garvatskii},
     title = {A~characterization of projection subsets in semigroups of transformations},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {27--40},
     publisher = {mathdoc},
     number = {9},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1974_9_a3/}
}