[1] A. H. Clifford, G. B. Preston:
The algebraic Theory of Semigroups. Vol. I, Math. Surveys No. 7, Amer. Math. Soc., Providence, R. I., (1961).
MR 0132791 |
Zbl 0111.03403
[3] S. Lajos:
О Полугруппе Подмножеств Полугруппы. Publ. Math. Debrecen, 11 (1964) 223-226.
Zbl 0275.60015
[4] S. Lajos:
Note on $(m, n)$-ideals. II, Proc. Japan Acad., 40 (1964) 631 - 632.
MR 0172949
[5] S. Lajos:
On semigroups that are semilattices of groups. II, Dept. Math. K. Marx Univ. of Economics, Budapest (1971).
MR 0318360 |
Zbl 0242.20067
[7] S. Lajos:
Theorems on $(1, 1)$-ideals in semigroups. Dept. Math. K. Marx Univ. of Economics, Budapest (1972).
MR 0338227 |
Zbl 0245.20058
[8] S. Lajos:
Characterizations of semilattices of groups. Math. Balkanica, 3 (1973) 310-311.
MR 0354914 |
Zbl 0287.20059
[9] D. Latorre:
On semigroups that are semilattices of groups. Czechoslovak Math. J., 21 (96) (1971) 369-370.
MR 0289683 |
Zbl 0225.20038
[10] J. Luh:
A characterization of regular rings. Proc. Japan Acad., 39 (1964) 741 - 742.
MR 0161879
[15] S. Schwarz:
A theorem on normal semigroups. Czechoslovak Math. J., 10 (85) (1960) 197-200.
MR 0116075 |
Zbl 0098.01704