@misc{leu-01-assisi-www,
  author = {Kristin Leutwyler},
  title = {Solving a Digital Jigsaw Puzzle},
  url = {http://www.sciam.com/explorations/2001/062501fresco/},
  howpublished = {WWW document},
  year = 2001,
  comment = {About the computer-assisted reconstruction of the Assisi Cathedral frescoes, especially the automatic texture-based indexing program of Mitra, Neri, and Carli at UC Santa Barbara.}
}