@article{1102912468, author = {Johnson, Charles R.}, title = {The Hadamard product of $A$ and $A^{\ast}$.}, journal = {Pacific J. Math.}, volume = {55}, number = {2}, year = {1974}, pages = { 477-481}, language = {en}, url = {http://dml.mathdoc.fr/item/1102912468} }
Johnson, Charles R. The Hadamard product of $A$ and $A^{\ast}$.. Pacific J. Math., Tome 55 (1974) no. 2, pp. 477-481. http://gdmltest.u-ga.fr/item/1102912468/