@patent{SchToyUyt08,
  title = {Interactive images},
  howpublished = {United States Patent, No 7421115},
  month = sep,
  year = {2008},
  note = {(expired)},
  slug = {schtoyuyt08},
  author = {Sch{\"o}lkopf, B. and Toyama, K. and Uyttendaele, M.},
  month_numeric = {9}
}