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@article{MZ_1968__105_170995, author = {Charles S. Ballantine}, title = {On the {Hammard} {Product.}}, journal = {Mathematische Zeitschrift}, pages = {365--366}, publisher = {mathdoc}, volume = {105}, year = {1968}, zbl = {0162.04204}, url = {http://geodesic.mathdoc.fr/item/MZ_1968__105_170995/} }
Charles S. Ballantine. On the Hammard Product.. Mathematische Zeitschrift, Tome 105 (1968), pp. 365-366. http://geodesic.mathdoc.fr/item/MZ_1968__105_170995/