@article{BUMI_2002_8_5B_1_a10,
     author = {Tancredi, Alessandro and Tognoli, Alberto},
     title = {On the analytic approximation of differentiable functions from above},
     journal = {Bollettino della Unione matematica italiana},
     pages = {227--233},
     publisher = {mathdoc},
     volume = {Ser. 8, 5B},
     number = {1},
     year = {2002},
     zbl = {1098.32003},
     mrnumber = {1915210},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BUMI_2002_8_5B_1_a10/}
}