DerechV. D. “Classification of Finite Commutative Semigroups for Which the Inverse Monoid of Local Automorphisms Is Permutable”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 64, no. 2, Feb. 2012, pp. 176-84, https://umj.imath.kiev.ua/index.php/umj/article/view/2564.