@article{MZ_1964__83_170215,
     author = {Hans Ehrmann},
     title = {Zum {Einschlie{\ss}ungssatz} von {Collatz} f\"ur die {Eigenwerte} von {Integralgleichungen.}},
     journal = {Mathematische Zeitschrift},
     pages = {67--71},
     publisher = {mathdoc},
     volume = {83},
     year = {1964},
     zbl = {0151.20401},
     url = {http://geodesic.mathdoc.fr/item/MZ_1964__83_170215/}
}