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@article{MZ_1985__189_173573, author = {Harry A.W.M. Kneppers}, title = {The {Hasse-Witt} {Matrix} of a {Formal} {Group.}}, journal = {Mathematische Zeitschrift}, pages = {151--166}, publisher = {mathdoc}, volume = {189}, year = {1985}, zbl = {0535.14021}, url = {http://geodesic.mathdoc.fr/item/MZ_1985__189_173573/} }
Harry A.W.M. Kneppers. The Hasse-Witt Matrix of a Formal Group.. Mathematische Zeitschrift, Tome 189 (1985), pp. 151-166. http://geodesic.mathdoc.fr/item/MZ_1985__189_173573/