@article{1077379456,
author = {Heinzer, Martin},
title = {Strongly convergent derivation automorphisms on a class of
wildly ramified $\upsilon$ -rings},
journal = {Duke Math. J.},
volume = {38},
number = {1},
year = {1971},
pages = { 99-108},
language = {en},
url = {http://dml.mathdoc.fr/item/1077379456}
}
Heinzer, Martin. Strongly convergent derivation automorphisms on a class of
wildly ramified $\upsilon$ -rings. Duke Math. J., Tome 38 (1971) no. 1, pp. 99-108. http://gdmltest.u-ga.fr/item/1077379456/