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Looking at Gabriel's theorem on Wikipedia page I found the following statement.

Dlab & Ringel (1973) found a generalization of Gabriel's theorem in which all Dynkin diagrams of finite-dimensional semisimple Lie algebras occur.

The reference point to a book which is not available and that I couldn't find. Does anybody know the statement which Wikipedia is referring to? Thanks

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A better reference might be the following:

Dlab, V.; Ringel, C.M. Indecomposable representations of graphs and algebras. Mem. Amer. Math. Soc. 1976, 6, v+57.

Also, the article Valued Graphs and the Representation Theory of Lie Algebras by Joel Lemay discusses this result.

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