@Misc{
  LusVil14,
  author = { Luca Lussardi and Elena Villa },
  title = { A general formula for the anisotropic outer Minkowski content of a set },
  journal = { Proc. Roy. Soc. Edinburgh Sect. A },
  year = { 2016 },
  volume = { 146 },
  number = { 2 },
  pages = { 393-413 },
}