@article{1077474862, author = {Cohen, Eckford}, title = {Sums of an odd number of squares in $GF[p^n, x]$}, journal = {Duke Math. J.}, volume = {15}, number = {1}, year = {1948}, pages = { 501-511}, language = {en}, url = {http://dml.mathdoc.fr/item/1077474862} }
Cohen, Eckford. Sums of an odd number of squares in $GF[p^n, x]$. Duke Math. J., Tome 15 (1948) no. 1, pp. 501-511. http://gdmltest.u-ga.fr/item/1077474862/