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@article{MAN_1980__247_163356, author = {Albrecht Pietsch}, title = {Weyl {Numbers} and {Eigenvalues} of {Operators} in {Banach} {Spaces.}}, journal = {Mathematische Annalen}, pages = {149--168}, publisher = {mathdoc}, volume = {247}, year = {1980}, zbl = {0428.47027}, url = {http://geodesic.mathdoc.fr/item/MAN_1980__247_163356/} }
Albrecht Pietsch. Weyl Numbers and Eigenvalues of Operators in Banach Spaces.. Mathematische Annalen, Tome 247 (1980), pp. 149-168. http://geodesic.mathdoc.fr/item/MAN_1980__247_163356/