@Phdthesis{bogers2009recommender,
  author = {Bogers, Toine},
  title  = {Recommender Systems for Social Bookmarking},

  year   = {2009},
  number = {},
  url    = {http://ilk.uvt.nl/~toine/phd-thesis/},

  const  = {\ text}
}
@Phdthesis{bogers2009recommender,
  author = {Bogers, Toine},
  title  = {Recommender Systems for Social Bookmarking},

  year   = {2009},
  number = {},
  url    = {http://ilk.uvt.nl/~toine/phd-thesis/},

  const  = {\ text}
}
@Phdthesis{bogers2009recommender,
  author = {Bogers, Toine},
  title  = {Recommender Systems for Social Bookmarking},

  year   = {2009},
  number = {},
  url    = {http://ilk.uvt.nl/~toine/phd-thesis/},

  const  = {\ text}
}
@Phdthesis{bogers2009recommender,
  author = {Bogers, Toine},
  title  = {Recommender Systems for Social Bookmarking},

  year   = {2009},
  number = {},
  url    = {http://ilk.uvt.nl/~toine/phd-thesis/},

  const  = {\ text}
}