1. Infinite root systems, representations of graphs and invariant theory;Kac;Invent. Math.,1980
2. Representations of K-species and bimodules;Ringel;J. Algebra,1976
3. About the Schur problems for DGC;Ovsienko,1977
4. Problems of linear algebra and classification of quadruples of subspaces in a finite-dimensional vector space;Gelfand;Coll. Math. Soc. Bolyai Tihany (Hungray),1970
5. Indecomposable representation of graphs and algebras;Dlab;Mem. Amer. Math. Soc.,1976