@article{MAN_1979__239_163210,
     author = {Theagenis J. Abatzoglou},
     title = {Norm {Derivatives} on {Spaces} of {Operators.}},
     journal = {Mathematische Annalen},
     pages = {129--136},
     publisher = {mathdoc},
     volume = {239},
     year = {1979},
     zbl = {0398.47013},
     url = {http://geodesic.mathdoc.fr/item/MAN_1979__239_163210/}
}