@article{10_14708_cm_v56i1_1131,
     author = {Jerzy Grzybowski and Diethard Pallaschke and Ryszard Urba\'nski},
     title = {Support functions and subdifferentials},
     journal = {Commentationes Mathematicae},
     pages = { 45\ensuremath{-}53},
     publisher = {mathdoc},
     volume = {56},
     number = {1},
     year = {2016},
     doi = {10.14708/cm.v56i1.1131},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v56i1.1131/}
}