@article{1077378463, author = {McConnel, Robert}, title = {Functions over finite fields preserving $m$-${\rm th}$ powers}, journal = {Duke Math. J.}, volume = {36}, number = {1}, year = {1969}, pages = { 465-472}, language = {en}, url = {http://dml.mathdoc.fr/item/1077378463} }
McConnel, Robert. Functions over finite fields preserving $m$-${\rm th}$ powers. Duke Math. J., Tome 36 (1969) no. 1, pp. 465-472. http://gdmltest.u-ga.fr/item/1077378463/