@article{MAN_1984__269_163920,
     author = {Bernhard Gramsch},
     title = {Relative {Inversion} in der {St\"orungstheorie} von {Operatoren} und {...-Algebren.}},
     journal = {Mathematische Annalen},
     pages = {27--72},
     publisher = {mathdoc},
     volume = {269},
     year = {1984},
     zbl = {0661.47037},
     url = {http://geodesic.mathdoc.fr/item/MAN_1984__269_163920/}
}