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@article{JLT_2004_14_2_JLT_2004_14_2_a2, author = {Y. Yoshii}, title = {Root {Systems} {Extended} by an {Abelian} {Group} and their {Lie} {Algebras}}, journal = {Journal of Lie theory}, pages = {371--394}, publisher = {mathdoc}, volume = {14}, number = {2}, year = {2004}, url = {http://geodesic.mathdoc.fr/item/JLT_2004_14_2_JLT_2004_14_2_a2/} }
Y. Yoshii. Root Systems Extended by an Abelian Group and their Lie Algebras. Journal of Lie theory, Tome 14 (2004) no. 2, pp. 371-394. http://geodesic.mathdoc.fr/item/JLT_2004_14_2_JLT_2004_14_2_a2/