@article{1028988897, author = {Ullman, J. L.}, title = {On a theorem of Frobenius.}, journal = {Michigan Math. J.}, volume = {1}, number = {2}, year = {1952}, pages = { 189-193}, language = {en}, url = {http://dml.mathdoc.fr/item/1028988897} }
Ullman, J. L. On a theorem of Frobenius.. Michigan Math. J., Tome 1 (1952) no. 2, pp. 189-193. http://gdmltest.u-ga.fr/item/1028988897/