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References:
[1] Numakura K.: On bicompact semigroups with zero. Bull. Yamagata Univ. 4 (1951), 405-412. MR 0065568
[2] Numakura K.: Prime ideals and idempotents in compact semigroups. Duke Math. J. 24, (1957), 671-680. MR 0091426 | Zbl 0218.22004
[3] Šulka R.: On the nilpotency in semigroups. Mat. časop. 18 (1968), 148-157. MR 0242979
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