On the ranks of certain semigroups of order-preserving transformations
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Tài liệu tham khảo
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Gomes, Gracinda M. S., and John M. Howie,On the ranks of certain finite semigroups of transformations, Math. Proc. Cambridge Phil. Soc.101 (1987), 395–403.
Howie, John M.,Products of idempotents in certain semigroups of transformations, Proc. Edinburgh Math. Soc. (2),17 (1971), 223–236.
Howie, John M., “An introduction to semigroup theory”, Academic Press, 1976.