1. M. Auslander andI. Reiten, On the representation type of triangular matrix rings. J. London Math. Soc. (2)12, 371–382 (1976).
2. R. Bautista, On algebras close to hereditary Artin algebras. Communicacion Interna35, Departamento de Matematicas, Faculdad de Ciencias, UNAM, Mexico 1978.
3. P.Dowbor and A.Skowroński, On the representation type of locally bounded categories. Tsukuba J. Math., to appear.
4. Yu. A.Drozd, On tame and wild matrix problems. Matrix problems, 104–114, Kiev 1977.
5. P. Gabriel, Indecomposable representations II. Symposia Math.11, 81–104 (1973).