@Inproceedings{yan2006document,
  author = {Yan, Xin and Li, Xue and Song, Dawei},
  title  = {Document generality: its computation for ranking},

  year   = {2006},
  number = {},
  url    = {http://portal.acm.org/citation.cfm?id=1151748},

  const  = {\ text}
}