Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MAN_1979__246_163343, author = {Frank Hansen}, title = {An {Operator} {Inequality.}}, journal = {Mathematische Annalen}, pages = {249--250}, publisher = {mathdoc}, volume = {246}, year = {1979}, zbl = {0407.47012}, url = {http://geodesic.mathdoc.fr/item/MAN_1979__246_163343/} }
Frank Hansen. An Operator Inequality.. Mathematische Annalen, Tome 246 (1979), pp. 249-250. http://geodesic.mathdoc.fr/item/MAN_1979__246_163343/