@article{MAN_1974__208_162567,
     author = {Harm Bart},
     title = {Holomorphic {Relative} {Inverses} of {Operator} {Valued} {Functions.}},
     journal = {Mathematische Annalen},
     pages = {179--194},
     publisher = {mathdoc},
     volume = {208},
     year = {1974},
     zbl = {0265.47028},
     url = {http://geodesic.mathdoc.fr/item/MAN_1974__208_162567/}
}