共 3 条
[1]
Clifford A., Preston G., Algebraic Theory of Semigroups, 1-2, (1961)
[2]
Hoehnke H.-J., Über das untere und obere Radikal einer Halbgruppe, Math. Z., 89, pp. 300-311, (1965)
[3]
Tishchenko A.V., Weak special and special radicals in semigroups, Mat. Sb., 94, 136, pp. 551-566, (1974)