@article{GDZPPN002393379, title = {Spektraleigenschaften positiver linearer Operatoren.}, journal = {Mathematische Zeitschrift}, volume = {82}, year = {1963}, pages = {303-313}, zbl = {0151.19801}, url = {http://dml.mathdoc.fr/item/GDZPPN002393379} }
Schaefer, Helmut H. Spektraleigenschaften positiver linearer Operatoren.. Mathematische Zeitschrift, Tome 82 (1963) pp. 303-313. http://gdmltest.u-ga.fr/item/GDZPPN002393379/