1. Generalized titled algebras of typeAn;Assem;Comm. Algebra,1981
2. Covering spaces in representation theory;Bongartz;Invent. Math.,1982
3. Isométrie parfaites, types de blocs, catégories dérivées;Broué;Astérisque,1990
4. Blocks of Tame Representation Type and Related Algebras;Erdmann,1990
5. The universal cover of a representation-finite algebra;Gabriel,1981