@article{1250523905,
author = {Nagata, Masayoshi},
title = {Flatness of an extension of a commutative ring},
journal = {J. Math. Kyoto Univ.},
volume = {9},
number = {3},
year = {1969},
pages = { 439-448},
language = {en},
url = {http://dml.mathdoc.fr/item/1250523905}
}
Nagata, Masayoshi. Flatness of an extension of a commutative ring. J. Math. Kyoto Univ., Tome 9 (1969) no. 3, pp. 439-448. http://gdmltest.u-ga.fr/item/1250523905/