@article{GDZPPN001164333, title = {The Norm of the Schur Product Operation.}, journal = {Numerische Mathematik}, volume = {4}, year = {1962}, pages = {343-344}, zbl = {0111.01504}, url = {http://dml.mathdoc.fr/item/GDZPPN001164333} }
DAVIS, CH. The Norm of the Schur Product Operation.. Numerische Mathematik, Tome 4 (1962) pp. 343-344. http://gdmltest.u-ga.fr/item/GDZPPN001164333/