@Article{ 
  dav02,
  author = { Davini, Andrea },
  title = { On calibrations for Lawson's cones },
  journal = { Rend. Sem. Mat. Univ. Padova },
  year = { 2004 },
  volume = { 111 },
  pages = { 55-70 },
  URL = { http://cvgmt.sns.it/paper/365/ },
  note = { cvgmt preprint}
}