@incollection{AST_1984__119-120__183_0,
     author = {Katz, Nicholas M.},
     title = {Expansion-coefficients as approximate solution of differential equations},
     booktitle = {Cohomologie $p$-adique},
     series = {Ast\'erisque},
     pages = {183--189},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {119-120},
     year = {1984},
     mrnumber = {773093},
     zbl = {0561.14010},
     language = {en},
     url = {http://archive.numdam.org/item/AST_1984__119-120__183_0/}
}