Two-dimensional formal groups: from isomorphism to isogeny.
Mathematische Zeitschrift, Tome 205 (1990) no. 3, pp. 309-314
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@article{MZ_1990__205_3_174176,
author = {Harry A.W.M. Kneppers},
title = {Two-dimensional formal groups: from isomorphism to isogeny.},
journal = {Mathematische Zeitschrift},
pages = {309--314},
publisher = {mathdoc},
volume = {205},
number = {3},
year = {1990},
zbl = {0685.14025},
url = {http://geodesic.mathdoc.fr/item/MZ_1990__205_3_174176/}
}
Harry A.W.M. Kneppers. Two-dimensional formal groups: from isomorphism to isogeny.. Mathematische Zeitschrift, Tome 205 (1990) no. 3, pp. 309-314. http://geodesic.mathdoc.fr/item/MZ_1990__205_3_174176/