@Inproceedings{parra2009evaluation,
  author = {Parra, Denis and Brusilovsky, Peter},
  title  = {Evaluation of Collaborative Filtering Algorithms for Recommending Articles on CiteULike},

  year   = {2009},
  number = {},
  url    = {http://ceur-ws.org/Vol-467/paper5.pdf},

  const  = {\ text}
}