A characterization of a class of 2-groups by their endomorphism semigroupsGramushnjak, Tatjana; Puusemp, PeeterGeneralized Lie theory in mathematics, physics and beyond2009 / p. 151-159 https://www.researchgate.net/publication/225250270_A_Characterization_Of_A_Class_Of_2-Groups_By_Their_Endomorphism_Semigroups