@article{IM_1980__60_142746,
     author = {George Lusztig},
     title = {On the {Unipotent} {Characters} of the {Exceptional} {Groups} {Over} {Finite} {Fields.}},
     journal = {Inventiones mathematicae},
     pages = {173--192},
     publisher = {mathdoc},
     volume = {60},
     year = {1980},
     zbl = {0443.20036},
     url = {http://geodesic.mathdoc.fr/item/IM_1980__60_142746/}
}