V. D. Derech, “Classification of Finite Commutative Semigroups for Which the Inverse Monoid of Local Automorphisms is a ∆-Semigroup”, Ukr. Mat. Zhurn., vol. 67, no. 7, pp. 867–873, Jul. 2015, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/2029