@Journal{DBLP:journals/www/DouglisBCK98,
   title = {The AT{\&}T Internet Difference Engine: Tracking and Viewing Changes on the Web},
   author = {Fred Douglis and Thomas Ball and Yih-Farn Chen and Eleftherios Koutsofios},
   year = 1998,
   Journal = {World Wide Web},
   Volume = 1,
   Number = 1,
   Pages = {27-44},
   att_url = {http://www2.research.att.com/areas/visualization/papers_videos/pdf/DBLP-journals-www-DouglisBCK98.pdf}
}