@article{GDZPPN002110431, title = {Parabolic subgroups with Abelian unipotent radical.}, journal = {Inventiones mathematicae}, volume = {110}, year = {1992}, pages = {649-671}, zbl = {0786.20029}, url = {http://dml.mathdoc.fr/item/GDZPPN002110431} }
Richardson, R.; Röhrle, G.; Steinberg, R. Parabolic subgroups with Abelian unipotent radical.. Inventiones mathematicae, Tome 110 (1992) pp. 649-671. http://gdmltest.u-ga.fr/item/GDZPPN002110431/