TY  - JOUR
AU  - Fabian, M.
TI  - Sub differentiability and trustworthiness in the light of a new variational principle of Borwein and Preiss
JO  - Acta Universitatis Carolinae. Mathematica et Physica
PY  - 1989
SP  - 51
EP  - 56
VL  - 30
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AUCMP_1989__30_2_a6/
LA  - en
ID  - AUCMP_1989__30_2_a6
ER  -