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@article{FORUM_1989__1_3_141602, author = {Helmut V\"olklein}, title = {The {1-Cohomology} of the {Adjoint} {Module} of a {Chevalley} {Group.}}, journal = {Forum mathematicum}, pages = {1--14}, publisher = {mathdoc}, volume = {1}, number = {3}, year = {1989}, zbl = {0649.20042}, url = {http://geodesic.mathdoc.fr/item/FORUM_1989__1_3_141602/} }
Helmut Völklein. The 1-Cohomology of the Adjoint Module of a Chevalley Group.. Forum mathematicum, Tome 1 (1989) no. 3, pp. 1-14. http://geodesic.mathdoc.fr/item/FORUM_1989__1_3_141602/