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@article{MM2_1988__60_2_155295, author = {Daniel Gross}, title = {On the fundamental group of the fixed points of an unipotent action.}, journal = {Manuscripta mathematica}, pages = {487--496}, publisher = {mathdoc}, volume = {60}, number = {2}, year = {1988}, zbl = {0647.32028}, url = {http://geodesic.mathdoc.fr/item/MM2_1988__60_2_155295/} }
Daniel Gross. On the fundamental group of the fixed points of an unipotent action.. Manuscripta mathematica, Tome 60 (1988) no. 2, pp. 487-496. http://geodesic.mathdoc.fr/item/MM2_1988__60_2_155295/