@article{GDZPPN002295474, title = {\"Uber das Randspektrum positiver Operatoren.}, journal = {Mathematische Annalen}, volume = {161}, year = {1965}, pages = {289-293}, zbl = {0151.19802}, url = {http://dml.mathdoc.fr/item/GDZPPN002295474} }
SCHAEFER, H.H. Über das Randspektrum positiver Operatoren.. Mathematische Annalen, Tome 161 (1965) pp. 289-293. http://gdmltest.u-ga.fr/item/GDZPPN002295474/