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References:
[1] SATKO L.-GROSEK O.: On SLA-ideals. Math. Slovaca 45 (1995), 45-52. MR 1335839 | Zbl 0840.20065
[2] RANKIN S. A.-REIS C. M.: Semigroups with quasi-zeros. Canad. J. Math. 32 (1980), 511-530. MR 0586972
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