On the idempotent ranks of certain semigroups of order-preserving transformations.
Portugaliae mathematica, Tome 51 (1994) no. 2, pp. 185-204.

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Keywords: semigroup of order-preserving mappings, rank, finite semigroup, idempotent rank, idempotent generators
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     title = {On the idempotent ranks of certain semigroups of order-preserving transformations.},
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Garba, G.U. On the idempotent ranks of certain semigroups of order-preserving transformations.. Portugaliae mathematica, Tome 51 (1994) no. 2, pp. 185-204. http://geodesic.mathdoc.fr/item/PORMA_1994__51_2_47075/