[2] CLIFFORD A. H., PRESTON G. B.:
The algebraic theory of semigroups I. Amer. Math. Soc, Providence, R. I., 1961.
MR 0132791
[3] HALL M.:
The position of the radical in an algebra. Tгans. Amer. Math. Soc. 48, 1940, 391-404.
MR 0002855 |
Zbl 0025.39102
[4] LUH J.:
On the concepts of гadicals of semigroups having a kernel. Port. Math. 19, 1960, 189-198.
MR 0131482
[5] McCOY N. H.:
The maximal regular ideal of a ring. Proc. Amer. Math. Soc 1, 1950, 165-171.
MR 0034757 |
Zbl 0036.29702
[7] ŠULKA R.:
On nilpotent elements, ideals and radicals of a semigroup. Mat.-fyz. Čas. 13, 1963, 209-222.
MR 0199297
[8] ŠULKA R.:
A note on the Ševrin radical in semigroups. Mat. Čas. 18, 1968, 57-58.
MR 0242978