@incollection{AST_1987__150-151__67_0,
     author = {\'Ecalle, Jean},
     title = {Classification analytique des champs hamiltoniens locaux. {Invariants} holomorphes et hamiltoniens \'etrangers},
     booktitle = {Singularit\'es d'\'equations diff\'erentielles - Dijon, 20-25 mai 1985},
     series = {Ast\'erisque},
     pages = {67--86},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {150-151},
     year = {1987},
     zbl = {0665.58036},
     language = {fr},
     url = {http://www.numdam.org/item/AST_1987__150-151__67_0/}
}