@article{10_4064_sm224_2_1,
     author = {Armin Rainer and Gerhard Schindl},
     title = {Composition in ultradifferentiable classes},
     journal = {Studia Mathematica},
     pages = {97--131},
     publisher = {mathdoc},
     volume = {224},
     number = {2},
     year = {2014},
     doi = {10.4064/sm224-2-1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm224-2-1/}
}