@electronic{www.uba.uva.nl,
   title       = {Academic Social Referencing tools: a user trial with BibSonomy and Cite-U-Like organized by the Library of the University of Amsterdam}, 
   url         = {http://www.uba.uva.nl/social_referencing},
   biburl      = {https://puma.uni-kassel.de/url/dddefc72666c29b29c9f073f3f335a97/hotho},
   keywords    = {2.0 bibsonomy citeulike research studie web},
   added-at    = {2007-03-12T08:45:44.000+0100},
   description = {},
   interhash   = {dddefc72666c29b29c9f073f3f335a97}, 
   intrahash   = {dddefc72666c29b29c9f073f3f335a97}
}

@electronic{itst.org,
   title       = {Recommender}, 
   url         = {http://itst.org/culneighbors.php},
   biburl      = {https://puma.uni-kassel.de/url/473d8f74772811cfebe9b0faa65505a1/hotho},
   keywords    = {recommender 2.0 tools citeulike},
   added-at    = {2007-02-21T09:41:44.000+0100},
   description = {},
   interhash   = {473d8f74772811cfebe9b0faa65505a1}, 
   intrahash   = {473d8f74772811cfebe9b0faa65505a1}
}