@article{GDZPPN002430452,
title = {The Hasse-Witt Matrix of a Formal Group.},
journal = {Mathematische Zeitschrift},
volume = {189},
year = {1985},
pages = {151-166},
zbl = {0535.14021},
url = {http://dml.mathdoc.fr/item/GDZPPN002430452}
}
Kneppers, Harry A.W.M. The Hasse-Witt Matrix of a Formal Group.. Mathematische Zeitschrift, Tome 189 (1985) pp. 151-166. http://gdmltest.u-ga.fr/item/GDZPPN002430452/