@misc{marenzi20081030providing,
  added-at = {2015-03-16T22:55:24.000+0100},
  author = {Marenzi, Ivana and Zerr, Sergej and Nejdl, Wolfgang},
  biburl = {https://www.bibsonomy.org/bibtex/212a501ae30ec4b9b7e715c25778f9043/zerr},
  interhash = {f1546b4f8f0806878909c5f9e28a9e73},
  intrahash = {12a501ae30ec4b9b7e715c25778f9043},
  keywords = {learnweb learnweb20 myown},
  timestamp = {2015-03-16T22:55:24.000+0100},
  title = { Providing Social Sharing Functionalities in LearnWeb2.0   },
  year = 2008
}

@misc{marenzi20081030providing,
  added-at = {2012-12-11T11:46:58.000+0100},
  author = {Marenzi, Ivana and Zerr, Sergej and Nejdl, Wolfgang},
  biburl = {https://www.bibsonomy.org/bibtex/212a501ae30ec4b9b7e715c25778f9043/marenzi},
  interhash = {f1546b4f8f0806878909c5f9e28a9e73},
  intrahash = {12a501ae30ec4b9b7e715c25778f9043},
  keywords = {LearnWeb20 learnweb20 myown sharing},
  timestamp = {2013-01-25T17:24:56.000+0100},
  title = { Providing Social Sharing Functionalities in LearnWeb2.0   },
  year = 2008
}