@article{RM_1968_23_1_a11,
     author = {E. Ya. Gabovich},
     title = {Ordered periodic semigroups},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1968},
     volume = {23},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1968_23_1_a11/}
}