@article{10_4064_sm179_2_3,
     author = {Bas Lemmens and Beata Randrianantoanina and Onno van Gaans},
     title = {Second derivatives of norms and
 contractive complementation in vector-valued spaces},
     journal = {Studia Mathematica},
     pages = {149--166},
     year = {2007},
     volume = {179},
     number = {2},
     doi = {10.4064/sm179-2-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm179-2-3/}
}