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@article{MAN_1977__231_163049, author = {George Luna}, title = {On the {Numerical} {Range} in {Reflexive} {Banach} {Spaces.}}, journal = {Mathematische Annalen}, pages = {33--38}, publisher = {mathdoc}, volume = {231}, year = {1977}, zbl = {0347.46010}, url = {http://geodesic.mathdoc.fr/item/MAN_1977__231_163049/} }
George Luna. On the Numerical Range in Reflexive Banach Spaces.. Mathematische Annalen, Tome 231 (1977), pp. 33-38. http://geodesic.mathdoc.fr/item/MAN_1977__231_163049/