@incollection{AST_2005__298__255_0,
     author = {Oort, Frans},
     title = {Newton polygons and $p$-divisible groups: a conjecture by {Grothendieck}},
     booktitle = {Formes automorphes (I) - Actes du semestre du centre \'Emile Borel, printemps 2000},
     editor = {Tilouine Jacques and Carayol Henri and Harris Michael and Vign\'eras Marie-France},
     series = {Ast\'erisque},
     pages = {255--269},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {298},
     year = {2005},
     mrnumber = {2141704},
     zbl = {1078.14063},
     language = {en},
     url = {http://archive.numdam.org/item/AST_2005__298__255_0/}
}