@article{1250524891,
author = {Okugawa, K\^otaro},
title = {Basic properties of differential fields of an arbitrary characteristic and the Picard-Vessiot theory},
journal = {J. Math. Kyoto Univ.},
volume = {2},
number = {3},
year = {1962},
pages = { 295-322},
language = {en},
url = {http://dml.mathdoc.fr/item/1250524891}
}
Okugawa, Kôtaro. Basic properties of differential fields of an arbitrary characteristic and the Picard-Vessiot theory. J. Math. Kyoto Univ., Tome 2 (1962) no. 3, pp. 295-322. http://gdmltest.u-ga.fr/item/1250524891/