%0 Journal Article %A H.-O. Walther %T Maps which are continuously differentiable in the sense of Michal and Bastiani but not of Fr\'echet %J Contemporary Mathematics. Fundamental Directions %D 2017 %P 543-556 %V 63 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMFD_2017_63_4_a0/ %G ru %F CMFD_2017_63_4_a0