%0 Book Section %A Katz, Nicholas M. %T Expansion-coefficients as approximate solution of differential equations %B Cohomologie $p$-adique %A Collectif %S Astérisque %D 1984 %P 183-189 %N 119-120 %I Société mathématique de France %U http://archive.numdam.org/item/AST_1984__119-120__183_0/ %G en %F AST_1984__119-120__183_0