%0 Journal Article
%A Fabian, M.
%T Sub differentiability and trustworthiness in the light of a new variational principle of Borwein and Preiss
%J Acta Universitatis Carolinae. Mathematica et Physica
%D 1989
%P 51-56
%V 30
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AUCMP_1989__30_2_a6/
%G en
%F AUCMP_1989__30_2_a6