@article{1077490342, author = {Williamson, John}, title = {Quasi-unitary matrices}, journal = {Duke Math. J.}, volume = {3}, number = {1}, year = {1937}, pages = { 715-725}, language = {en}, url = {http://dml.mathdoc.fr/item/1077490342} }
Williamson, John. Quasi-unitary matrices. Duke Math. J., Tome 3 (1937) no. 1, pp. 715-725. http://gdmltest.u-ga.fr/item/1077490342/