@article{GDZPPN002208059,
title = {A projective invariant comparing rings of integers in wildly ramified extensions.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {405},
year = {1990},
pages = {35-47},
zbl = {0713.11077},
url = {http://dml.mathdoc.fr/item/GDZPPN002208059}
}
Wilson, S.M.J. A projective invariant comparing rings of integers in wildly ramified extensions.. Journal für die reine und angewandte Mathematik, Tome 405 (1990) pp. 35-47. http://gdmltest.u-ga.fr/item/GDZPPN002208059/