@article{SM_1974_23_4_a3,
     author = {A. V. Tishchenko},
     title = {Weakly special and special radicals in semigroups},
     journal = {Sbornik. Mathematics},
     pages = {521--534},
     publisher = {mathdoc},
     volume = {23},
     number = {4},
     year = {1974},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1974_23_4_a3/}
}