@article{1077468348, author = {Marcus, Marvin}, title = {All linear operators leaving the unitary group invariant}, journal = {Duke Math. J.}, volume = {26}, number = {1}, year = {1959}, pages = { 155-163}, language = {en}, url = {http://dml.mathdoc.fr/item/1077468348} }
Marcus, Marvin. All linear operators leaving the unitary group invariant. Duke Math. J., Tome 26 (1959) no. 1, pp. 155-163. http://gdmltest.u-ga.fr/item/1077468348/