%0 Journal Article %A Harry A.W.M. Kneppers %T The Hasse-Witt Matrix of a Formal Group. %J Mathematische Zeitschrift %D 1985 %P 151-166 %V 189 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZ_1985__189_173573/ %F MZ_1985__189_173573