@incollection{AST_1989__173-174__111_0,
     author = {Mars, J. G. M. and Springer, T. A.},
     title = {Character sheaves},
     booktitle = {Orbites unipotentes et repr\'esentations III. Orbites et faisceaux pervers},
     series = {Ast\'erisque},
     pages = {111--198},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {173-174},
     year = {1989},
     mrnumber = {1021511},
     zbl = {0706.20032},
     language = {en},
     url = {http://archive.numdam.org/item/AST_1989__173-174__111_0/}
}