DERECH, V. D. Classification of Finite Commutative Semigroups for Which the Inverse Monoid of Local Automorphisms is a ∆-Semigroup. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 67, n. 7, p. 867–873, 2015. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2029. Acesso em: 5 dec. 2025.