@Article{ 
  gradamdeta,
  author = { D'Ambrosio, P. and De Tommasi, D. and Granieri, Luca and Maddalena, Francesco },
  title = { A surface energy approach to the mass reduction problem for elastic bodies. },
  journal = { IMA Journal of Applied Mathematics },
  year = { 2009 },
  number = { 74 },
  pages = { 934-949 },
  URL = { http://cvgmt.sns.it/paper/1364/ },
  note = { cvgmt preprint}
}