@incollection{AST_1979__64__87_0,
     author = {Raynaud, Michel},
     title = { {\guillemotleft}~$p$-torsion~{\guillemotright} du sch\'ema de {Picard}},
     booktitle = {Journ\'ees de g\'eom\'etrie alg\'ebrique de Rennes - (Juillet 1978) (II) : Groupes formels, repr\'esentations galoisiennes et cohomologie des vari\'et\'es de caract\'eristique positive},
     series = {Ast\'erisque},
     pages = {87--148},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {64},
     year = {1979},
     mrnumber = {563468},
     zbl = {0434.14024},
     language = {fr},
     url = {http://archive.numdam.org/item/AST_1979__64__87_0/}
}