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@article{MAN_1974__210_162624, author = {C.V. Hutton}, title = {On the {Approximation} {Numbers} of an {Operator} and {Its} {Adjoint.}}, journal = {Mathematische Annalen}, pages = {277--280}, publisher = {mathdoc}, volume = {210}, year = {1974}, zbl = {0272.47017}, url = {http://geodesic.mathdoc.fr/item/MAN_1974__210_162624/} }
C.V. Hutton. On the Approximation Numbers of an Operator and Its Adjoint.. Mathematische Annalen, Tome 210 (1974), pp. 277-280. http://geodesic.mathdoc.fr/item/MAN_1974__210_162624/