@article{CMUC_1985__26_3_a12,
     author = {Aversa, Vincenzo and Laczkovich, M. and Preiss, David},
     title = {Extension of differentiable functions},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {597--609},
     publisher = {mathdoc},
     volume = {26},
     number = {3},
     year = {1985},
     mrnumber = {817830},
     zbl = {0583.26003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1985__26_3_a12/}
}