%0 Journal Article %A Richard J. Fleissner %A James Foran %T Transformations of differentiable functions %J Colloquium Mathematicum %D 1978 %P 277-284 %V 39 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-39-2-277-284/ %R 10.4064/cm-39-2-277-284 %G en %F 10_4064_cm_39_2_277_284