%0 Journal Article
%A Aparicio, C.
%A Ocaña, F.
%A Payá, R.
%A Rodríguez, A.
%T A non-smooth extension of Frechet differentiability of the norm with applications to numerical ranges
%J Glasgow mathematical journal
%D 1986
%P 121-137
%V 28
%N 2
%U http://geodesic.mathdoc.fr/articles/10.1017/S0017089500006443/
%R 10.1017/S0017089500006443
%F 10_1017_S0017089500006443