@article{GDZPPN002550059,
title = {Strong normality and normality for difference fields.},
journal = {Aequationes mathematicae},
volume = {20},
year = {1980},
pages = {159-165},
zbl = {0459.12018},
url = {http://dml.mathdoc.fr/item/GDZPPN002550059}
}
Infante, Ronald P. Strong normality and normality for difference fields.. Aequationes mathematicae, Tome 20 (1980) pp. 159-165. http://gdmltest.u-ga.fr/item/GDZPPN002550059/