@article{MZ_1991__206_1_174210,
     author = {E. Amar},
     title = {On the extension of {C.R.} functions.},
     journal = {Mathematische Zeitschrift},
     pages = {89--102},
     year = {1991},
     volume = {206},
     number = {1},
     zbl = {0721.32008},
     url = {http://geodesic.mathdoc.fr/item/MZ_1991__206_1_174210/}
}