@misc{lev-99-urbis-wwwr,
  author = {Marc Levoy},
  title = {Scanning the Fragments of the {Forma} {Urbis} {Romae}},
  url = {http://www.graphics.stanford.edu/projects/mich/forma-urbis/forma-urbis.html},
  howpublished = {WWW document},
  year = 1999,
  month = may,
  altkeys = {lev-99-urbis-www}
}