TY  - JOUR
AU  - Aparicio, C.
AU  - Ocaña, F.
AU  - Payá, R.
AU  - Rodríguez, A.
TI  - A non-smooth extension of Frechet differentiability of the norm with applications to numerical ranges
JO  - Glasgow mathematical journal
PY  - 1986
SP  - 121
EP  - 137
VL  - 28
IS  - 2
UR  - http://geodesic.mathdoc.fr/articles/10.1017/S0017089500006443/
DO  - 10.1017/S0017089500006443
ID  - 10_1017_S0017089500006443
ER  -