1. P. Dowbor andA. Skowro?ski, On Galois coverings of tame algebras. Arch. Math.44, 522?529 (1985).
2. Y. A.Drozd, On tame and wild matrix problems (Russian). In: Matrix Problems 104?114. Kiev 1977.
3. Y. A. Drozd, Tame and wild matrix problems (Russian). In: Representations and quadratic forms, Collect. sci Works, Kiev1979, 39?74 (1979); English translation: Amer. Math. Soc. Transl. Ser. 2128, 31?55 (1986).
4. P. Gabriel, Finite representation type is open. In: Representations of algebras. LNM488, 132?155. Berlin-Heidelberg-New York 1975.
5. C.Geiss, Tame distributive algebras and related topics. Doctoral Thesis, Universit�t Bayreuth 1993.