@article{FPM_1997_3_3_a14,
     author = {I. B. Kozhukhov},
     title = {Semigroups with right congruences of finite index},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {869--878},
     publisher = {mathdoc},
     volume = {3},
     number = {3},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_1997_3_3_a14/}
}