@incollection{AST_1989__173-174__1_0,
     author = {AST},
     title = {Orbites unipotentes et repr\'esentations {III.} {Orbites} et faisceaux pervers - {Pages} pr\'eliminaires},
     booktitle = {Orbites unipotentes et repr\'esentations III. Orbites et faisceaux pervers},
     series = {Ast\'erisque},
     pages = {1--11},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {173-174},
     year = {1989},
     language = {fr},
     url = {http://www.numdam.org/item/AST_1989__173-174__1_0/}
}