@article{MAN_1988__280_3_164381,
     author = {W. Ruess and C. Stegall},
     title = {Fr\'echet {Differentiability} of the {Norm} in {Operator} {Spaces.}},
     journal = {Mathematische Annalen},
     pages = {527--536},
     publisher = {mathdoc},
     volume = {280},
     number = {3},
     year = {1988},
     zbl = {0618.47041},
     url = {http://geodesic.mathdoc.fr/item/MAN_1988__280_3_164381/}
}