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Clean endomorphism rings

Archiv der Mathematik, 2004
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Nicholson, W. K.   +2 more
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Abelian groups as endomorphic modules over their endomorphism ring

Journal of Mathematical Sciences, 2008
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Chistyakov, D. S., Lyubimtsev, O. V.
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Endomorphisms of graphs I. The monoid of strong endomorphisms

Archiv der Mathematik, 1989
[Part II, cf. the review below.] We use the fact that every graph is a generalized lexicographic product of an S-unretractive graph with sets, to show that the monoid of strong endomorphisms of any graph is isomorphic to a wreath product of a group with a certain small category.
Knauer, Ulrich, Nieporte, Martin
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Commutative Endomorphism Rings

Canadian Journal of Mathematics, 1971
The problem of classifying the torsion-free abelian groups with commutative endomorphism rings appears as Fuchs’ problems in [ 4 , Problems 46 and 47]. They are far from solved, and the obstacles to a solution appear formidable (see [ 4; 5 ]).
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