Representation-finite tree algebras
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Dlab, Vlastimil ; Ringel, Claus MichaelIn: Proceedings of the American Mathematical Society, Jg. 83 H. 2, S. 228-2321981Every semiprimary ring is the endomorphism ring of a projective module over a quasi-hereditary ring
Dlab, Vlastimil ; Ringel, Claus MichaelIn: Proceedings of the American Mathematical Society, Jg. 107 H. 1, S. 1-51989The Hochschild cocycle corresponding to a long exact sequence
Dlab, Vlastimil ; Ringel, Claus MichaelIn: Tsukuba Journal of Mathematics, Jg. 14 H. 2, S. 489-4961990