V. D. Derech, “Structure of a finite commutative inverse semigroup and a finite bundle for which the inverse monoid of local automorphisms is permutable”, Ukr. Mat. Zhurn., vol. 63, no. 9, pp. 1218–1226, Sep. 2011, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/2799