@book{SB_1989-1990__32_, author = {Collectif}, title = {S\'eminaire {Bourbaki} : volume 1989/90, expos\'es 715-729}, series = {Ast\'erisque}, publisher = {Soci\'et\'e math\'ematique de France}, number = {189-190}, year = {1990}, url = {http://archive.numdam.org/item/SB_1989-1990__32_/} }