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@article{AM2_1969__2_182304, author = {F.F. BONSALL and B.E. CAIN and H. SCHNEIDER}, title = {The {Numerical} {Range} of a {Continuous} {Mapping} of a {Normed} {Space}}, journal = {Aequationes mathematicae}, pages = {86--93}, publisher = {mathdoc}, volume = {2}, year = {1969}, zbl = {0162.20101}, url = {http://geodesic.mathdoc.fr/item/AM2_1969__2_182304/} }
F.F. BONSALL; B.E. CAIN; H. SCHNEIDER. The Numerical Range of a Continuous Mapping of a Normed Space. Aequationes mathematicae, Tome 2 (1969), pp. 86-93. http://geodesic.mathdoc.fr/item/AM2_1969__2_182304/