@article{CC_2008_37_4_a7,
     author = {Delfour, Michel C.},
     title = {Representations of hypersurfaces and minimal smoothness of the midsurface in the theory of shells},
     journal = {Control and Cybernetics},
     pages = {879--911},
     year = {2008},
     volume = {37},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CC_2008_37_4_a7/}
}