@article{GDZPPN002403668,
title = {\"Uber das Spektrum positiver Operatoren.},
journal = {Mathematische Zeitschrift},
volume = {105},
year = {1968},
pages = {15-32},
zbl = {0179.18002},
url = {http://dml.mathdoc.fr/item/GDZPPN002403668}
}
Lotz, Heinrich P. Über das Spektrum positiver Operatoren.. Mathematische Zeitschrift, Tome 105 (1968) pp. 15-32. http://gdmltest.u-ga.fr/item/GDZPPN002403668/