@article{SM_1973_21_4_a2,
     author = {E. N. Roiz},
     title = {On~the compressive radical of semigroups},
     journal = {Sbornik. Mathematics},
     pages = {523--534},
     publisher = {mathdoc},
     volume = {21},
     number = {4},
     year = {1973},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1973_21_4_a2/}
}