https://harvester.nas.gov.ua/Record/admjournalluguniveduua-article-1846?sid=163570978
Description: Quasi-idempotents in finite semigroup of full order-preserving transformations ::...
finite semigroupdescriptionquasiidempotentsfull
https://khazna.ku.ac.ae/en/publications/on-the-semigroup-of-finite-order-preserving-partial-injective-con/
On the semigroup of finite order-preserving partial injective contraction mappings - Khalifa...
on thefinite ordersemigrouppreservingpartial
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