@article{1028998511, author = {Herstein, I. N.}, title = {Power maps in rings.}, journal = {Michigan Math. J.}, volume = {8}, number = {1}, year = {1961}, pages = { 29-32}, language = {en}, url = {http://dml.mathdoc.fr/item/1028998511} }
Herstein, I. N. Power maps in rings.. Michigan Math. J., Tome 8 (1961) no. 1, pp. 29-32. http://gdmltest.u-ga.fr/item/1028998511/