@Article{ 
  Sch13,
  author = { Schmidt, Thomas },
  title = { Strict interior approximation of sets of finite perimeter and functions of bounded variation },
  journal = { Proc. Am. Math. Soc. },
  year = { 2015 },
  volume = { 143 },
  number = { 5 },
  pages = { 2069-2084 },
  URL = { http://cvgmt.sns.it/paper/2152/ },
  note = { cvgmt preprint}
}