DerechV. D. “Classification of Finite Nilsemigroups for Which the Inverse Monoid of Local Automorphisms Is Permutable Semigroup”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 68, no. 5, May 2016, pp. 610-24, http://umj.imath.kiev.ua/index.php/umj/article/view/1865.