Happel, Dieter ; Ringel, Claus Michael ; Dlab, Vlastimil (Ed.) ; Gabriel, Peter (Ed.) ; Michler, Gerhard (Ed.)
In: Representation Theory I: Finite dimensional algebras: Proceedings of the Fourth International Conference on Representations of Algebras, held in Ottawa, Canada, August 16-25, ... Part 1, Vol. 1177, page 156-180
1986