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Bibliography

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Daniel I. A. Cohen.
Basic Techniques of Combinatorial Theory.
John Wiley & Sons, 1978.

2
John M. Howie.
Products of idempotents in finite full transformation semigroups.
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John M. Howie and Robert B. McFadden.
Idempotent rank in finite full transformation semigroups.
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to be submitted.

4
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A combinatorial property of finite full transformation semigroups.
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A length formula in a semigroup of mappings.
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Products of idempotents in finite full transformation semigroups.
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(to appear).

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M. Tainiter.
A characterization of idempotents in semigroups.
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Karen D. Toonen
1998-11-19