@Misc{ 
  fremorpar07,
  author = { Freddi, Lorenzo and Morassi, Antonino and Paroni, Roberto },
  title = { On the variational derivation of the kinematics for thin-walled closed section beams },
  journal = {  },
  year = { 2007 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/1195/ },
  note = { cvgmt preprint}
}