@article{GDZPPN002209330,
title = {The characters of the group of rational points of a reductive group with non-connected centre.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {426},
year = {1992},
pages = {155-192},
zbl = {0739.20018},
url = {http://dml.mathdoc.fr/item/GDZPPN002209330}
}
Lehrer, G.I.; Michel, J.; Digne, F. The characters of the group of rational points of a reductive group with non-connected centre.. Journal für die reine und angewandte Mathematik, Tome 426 (1992) pp. 155-192. http://gdmltest.u-ga.fr/item/GDZPPN002209330/