@Article{hammond2005social,
  author = {Hammond, Tony and Hannay, Timo and Lund, Ben and Scott, Joanna},
  title  = {Social Bookmarking Tools (I): A General Review},
  journal = {D-Lib Magazine},
  year   = {2005},
  number = {4},
  url    = {http://www.dlib.org/dlib/april05/hammond/04hammond.html},

  const  = {\ text}
}
@Article{lhfh05social,
  author = {Lund, Ben and Hammond, Tony and Flack, Martin and Hannay, Timo},
  title  = {Social Bookmarking Tools (II): A Case Study - Connotea},
  journal = {D-Lib Magazine},
  year   = {2005},
  number = {4},
  url    = {http://www.dlib.org/dlib/april05/lund/04lund.html},

  const  = {\ text}
}
@Inproceedings{tane03courseware,
  author = {Tane, Julien and Schmitz, Christoph and Stumme, Gerd and Staab, Steffen and Studer, R.},
  title  = {The Courseware Watchdog:  an Ontology-based tool for finding and organizing
                  learning material},

  year   = {2003},
  number = {},
  url    = {http://www.kde.cs.uni-kassel.de/stumme/papers/2003/tane2003courseware.pdf},

  const  = {\ text}
}