@article{JRAM_1975__273_151536,
     author = {Helmut Kroh},
     title = {Quasibeschr\"ankte {Fredholmoperatoren.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {23--30},
     year = {1975},
     volume = {273},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1975__273_151536/}
}