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@article{MZ_1963__82_170193, author = {Helmut H. Schaefer}, title = {Spektraleigenschaften positiver linearer {Operatoren.}}, journal = {Mathematische Zeitschrift}, pages = {303--313}, publisher = {mathdoc}, volume = {82}, year = {1963}, zbl = {0151.19801}, url = {http://geodesic.mathdoc.fr/item/MZ_1963__82_170193/} }
Helmut H. Schaefer. Spektraleigenschaften positiver linearer Operatoren.. Mathematische Zeitschrift, Tome 82 (1963), pp. 303-313. http://geodesic.mathdoc.fr/item/MZ_1963__82_170193/