@Article{cha2007tyt,
  author = {Cha, M. and Kwak, H. and Rodriguez, P. and Ahn, Y.Y. and Moon, S.},
  title  = {I tube, you tube, everybody tubes: analyzing the world's largest user generated content video system},

  year   = {2007},
  number = {},
  url    = {},

  const  = {\ text}
}
@Unpublished{hayes:ubt,
  author = {Hayes, C. and Avesani, P.},
  title  = {Using Blog Tags To Identify Topic Authorities},

  year   = {2007},
  number = {},
  url    = {https://apps.lis.uiuc.edu/wiki/display/LEADS/Fall+2007+Archive},

  const  = {\ text}
}
@Article{hayes2006aut,
  author = {Hayes, C. and Avesani, P. and Veeramachaneni, S.},
  title  = {An analysis of the use of tags in a blog recommender system},
  journal = {ITC-IRST Technical Report. http://sra. itc. it/people/hayes/pubs/06/hayes-ijcai07-tech-report. pdf},
  year   = {2006},
  number = {},
  url    = {},

  const  = {\ text}
}