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@article{IM_1980__56_142686, author = {V.G. Kac}, title = {Infinite {Root} {Systems,} {Representations} of {Graphs} and {Invariant} {Theory.}}, journal = {Inventiones mathematicae}, pages = {57--92}, publisher = {mathdoc}, volume = {56}, year = {1980}, zbl = {0427.17001}, url = {http://geodesic.mathdoc.fr/item/IM_1980__56_142686/} }
V.G. Kac. Infinite Root Systems, Representations of Graphs and Invariant Theory.. Inventiones mathematicae, Tome 56 (1980), pp. 57-92. http://geodesic.mathdoc.fr/item/IM_1980__56_142686/