@incollection{AST_1989__173-174__55_0,
     author = {Kashiwara, Masaki},
     title = {Representation theory and $D$-modules on flag varieties},
     booktitle = {Orbites unipotentes et repr\'esentations III. Orbites et faisceaux pervers},
     series = {Ast\'erisque},
     pages = {55--109},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {173-174},
     year = {1989},
     mrnumber = {1021510},
     zbl = {0705.22010},
     language = {en},
     url = {http://www.numdam.org/item/AST_1989__173-174__55_0/}
}