@article{GDZPPN002386380, title = {Extensions of a Theorem of Hellinger and Toeplitz.}, journal = {Mathematische Zeitschrift}, volume = {64}, year = {1956}, pages = {53-57}, zbl = {0072.13201}, url = {http://dml.mathdoc.fr/item/GDZPPN002386380} }
Taylor, Angus E. Extensions of a Theorem of Hellinger and Toeplitz.. Mathematische Zeitschrift, Tome 64 (1956) pp. 53-57. http://gdmltest.u-ga.fr/item/GDZPPN002386380/