@article{BUMI_2011_9_4_3_a1,
     author = {Appell, J. and Jes\'us, Z. and Mej{\'\i}a, O.},
     title = {Some {Remarks} on {Nonlinear} {Composition} {Operators} in {Spaces} of {Differentiable} {Functions}},
     journal = {Bollettino della Unione matematica italiana},
     pages = {321--336},
     publisher = {mathdoc},
     volume = {Ser. 9, 4},
     number = {3},
     year = {2011},
     zbl = {1229.47086},
     mrnumber = {2906764},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BUMI_2011_9_4_3_a1/}
}