%0 Journal Article %A Delfour, Michel C. %T Representations of hypersurfaces and minimal smoothness of the midsurface in the theory of shells %J Control and Cybernetics %D 2008 %P 879-911 %V 37 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/CC_2008_37_4_a7/ %G en %F CC_2008_37_4_a7