On semigroups that are semilattices of groups

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On semigroups that are semilattices of groups. (English). Czechoslovak Mathematical Journal, vol. 21 (1971), issue 3, pp. 369-370

References:

[1] S. Lajos: On semigroups which are semilattices of groups. Acta Sci. Math. 30 (1969), 133 - 135. MR 0246989 | Zbl 0174.30701

[2] Š. Schwarz: A theorem on normal semigroups. Czechoslovak Math. J. 10 (85), (1960), 197-200. MR 0116075 | Zbl 0098.01704

[3] S. Lajos: A criterion for Neumann regularity of normal semigroups. Acta. Sci. Math., 25 (1964), 172-173. MR 0166289 | Zbl 0142.25504

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