@article{MAN_1978__232_163077,
     author = {Bernhard Gramsch and Winfried Kaballo},
     title = {Regularisierung von {Fredholmfunktionen.}},
     journal = {Mathematische Annalen},
     pages = {151--162},
     year = {1978},
     volume = {232},
     zbl = {0384.47019},
     url = {http://geodesic.mathdoc.fr/item/MAN_1978__232_163077/}
}