@article{CMUC_2001_42_2_a5,
     author = {Duda, Jakub},
     title = {On inverses of $\delta$-convex mappings},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {281--297},
     year = {2001},
     volume = {42},
     number = {2},
     mrnumber = {1832147},
     zbl = {1053.47522},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2001_42_2_a5/}
}