@incollection{SB_2004-2005__47__247_0,
     author = {Powell, Geoffrey},
     title = {The {Mumford} conjecture},
     booktitle = {S\'eminaire Bourbaki : volume 2004/2005, expos\'es 938-951},
     series = {Ast\'erisque},
     note = {talk:945},
     pages = {247--282},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {307},
     year = {2006},
     mrnumber = {2296421},
     zbl = {1126.14032},
     language = {en},
     url = {http://archive.numdam.org/item/SB_2004-2005__47__247_0/}
}