@Unpublished{szekely2006ranking,
  author = {Szekely, Benjamin and Torres, Elias},
  title  = {Ranking Bookmarks and Bistros: Intelligent Community and Folksonomy Development},

  year   = {2005},
  number = {},
  url    = {http://torrez.us/archives/2005/07/13/tagrank.pdf},

  const  = {\ text}
}