@article{1077474122,
author = {Cohen, Eckford},
title = {Sums of an even number of squares in $GF[p^n,x]$},
journal = {Duke Math. J.},
volume = {14},
number = {1},
year = {1947},
pages = { 251-267},
language = {en},
url = {http://dml.mathdoc.fr/item/1077474122}
}
Cohen, Eckford. Sums of an even number of squares in $GF[p^n,x]$. Duke Math. J., Tome 14 (1947) no. 1, pp. 251-267. http://gdmltest.u-ga.fr/item/1077474122/