@article{GDZPPN002318636, title = {Weyl Numbers and Eigenvalues of Operators in Banach Spaces.}, journal = {Mathematische Annalen}, volume = {250}, year = {1980}, pages = {149-168}, zbl = {0428.47027}, url = {http://dml.mathdoc.fr/item/GDZPPN002318636} }
Pietsch, Albrecht. Weyl Numbers and Eigenvalues of Operators in Banach Spaces.. Mathematische Annalen, Tome 250 (1980) pp. 149-168. http://gdmltest.u-ga.fr/item/GDZPPN002318636/