@article{AUCMP_1989__30_2_a6,
     author = {Fabian, M.},
     title = {Sub differentiability and trustworthiness in the light of a new variational principle of {Borwein} and {Preiss}},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {51--56},
     publisher = {mathdoc},
     volume = {30},
     number = {2},
     year = {1989},
     mrnumber = {1046445},
     zbl = {0714.49022},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUCMP_1989__30_2_a6/}
}