@article{CMUC_1993_34_3_a3,
     author = {Vesel\'y, Libor},
     title = {The distance between subdifferentials in the terms of functions},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {419--424},
     year = {1993},
     volume = {34},
     number = {3},
     mrnumber = {1243073},
     zbl = {0809.49016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1993_34_3_a3/}
}