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Received: 20 August 1998 / in final form: 10 December 1998
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Bisgaard, T. Semiperfect countable C-finite semigroups S satisfying S = S + S . Math Ann 315, 141–168 (1999). https://doi.org/10.1007/s002080050320
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DOI: https://doi.org/10.1007/s002080050320