@electronic{www2008.org,
   title       = {WWW2008 Refereed Papers - WWW 2008: Refereed Papers}, 
   url         = {http://www2008.org/papers/fp648.html},
   biburl      = {https://puma.uni-kassel.de/url/fa296b9ff573c990a1a2e857958b7ed9/hotho},
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@electronic{www.wipo.int,
   title       = {(WO/2006/116196) MEDIA OBJECT METADATA ASSOCIATION AND RANKING}, 
   url         = {http://www.wipo.int/pctdb/en/wo.jsp?WO=2006%2F116196&IA=WO2006%2F116196&DISPLAY=STATUS},
   biburl      = {https://puma.uni-kassel.de/url/27088909ab209640d410793579a7dafa/hotho},
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@electronic{www.reliwa.de,
   title       = {Reliwa.de - Der Treffpunkt für Bücher-, Musik- und Filmliebhaber}, 
   url         = {http://www.reliwa.de/},
   biburl      = {https://puma.uni-kassel.de/url/d68a5d6433dfd9972e21457a0454d777/hotho},
   keywords    = {books bücher folksonomy music tagging tools},
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@electronic{beta.andunite.com,
   title       = {andUNITE - That's what we were looking for}, 
   url         = {http://beta.andunite.com/},
   biburl      = {https://puma.uni-kassel.de/url/fb3f0a89c2a6abdd96f780211d8301f3/hotho},
   keywords    = {folksonomy search tools},
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@electronic{jonudell.wordpress.com,
   title       = {Discovering versus teaching principles of social information management « Jon Udell}, 
   url         = {http://jonudell.wordpress.com/2007/12/12/discovering-versus-teaching-principles-of-social-information-management/},
   biburl      = {https://puma.uni-kassel.de/url/99a197126ebdd57dc5e579d3abc9a16b/hotho},
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@electronic{www.booktagger.com,
   title       = {Home | Booktagger}, 
   url         = {http://www.booktagger.com/},
   biburl      = {https://puma.uni-kassel.de/url/c75706d22b88387c51d1d134b1511735/hotho},
   keywords    = {book folksonomy literature publication tagging},
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@electronic{www.favoriten.de,
   title       = {Favoriten.de - social bookmarks online anlegen und verwalten}, 
   url         = {http://www.favoriten.de/},
   biburl      = {https://puma.uni-kassel.de/url/3e80a5ff93c3cd9f25eadea9c048b2bb/hotho},
   keywords    = {bookmarks deutsch folksonomy germany online social tagging verwalten},
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@electronic{www.twine.com,
   title       = {Twine}, 
   url         = {http://www.twine.com/},
   biburl      = {https://puma.uni-kassel.de/url/eaf2a0c49aff6eeda52c8b9cbd2cb0c9/hotho},
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@electronic{givealink.org,
   title       = {givealink.org}, 
   url         = {http://givealink.org/cgi-pub/mainPages/index.cgi},
   biburl      = {https://puma.uni-kassel.de/url/4f16a5cd468e718d6e5a26609aa50c20/hotho},
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@electronic{givealink.org,
   title       = {givealink.org}, 
   url         = {http://givealink.org/cgi-pub/mainPages/about/aboutus.cgi},
   biburl      = {https://puma.uni-kassel.de/url/9bee2ec18b327757ad0fe4ea5133e7cb/hotho},
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@electronic{log.netbib.de,
   title       = {netbib weblog » Blog Archive » 2collab - hinter Elseviers erstem Ausflug ins Web 2.0 steckt ein Bibliothekar}, 
   url         = {http://log.netbib.de/archives/2007/11/26/2collab-hinter-elseviers-erstem-ausflug-ins-web-20-steckt-ein-bibliothekar/},
   biburl      = {https://puma.uni-kassel.de/url/f8c21a2ca2295f79f0430734234819c9/hotho},
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@electronic{icio.de,
   title       = {/ - icio.de}, 
   url         = {http://icio.de/},
   biburl      = {https://puma.uni-kassel.de/url/1975afbe9433518dd543d7820346e3dc/hotho},
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@electronic{wwwalt.phil-fak.uni-duesseldorf.de,
   title       = {Univ.-Prof.Dr. W.G. Stock - Lehrstuhlinhaber für das Fach Informationswissenschaft an der Heinrich-Heine Univerität Düsseldorf || Informationswissenschaft Heinrich-Heine-Universität Düsseldorf}, 
   url         = {http://wwwalt.phil-fak.uni-duesseldorf.de/infowiss/content/mitarbeiter/stock.php},
   biburl      = {https://puma.uni-kassel.de/url/b471b7a3ccc72c55dc85b8bc885db1a7/hotho},
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@electronic{atomiq.org,
   title       = {Taxonomy of tagging systems (Atomiq)}, 
   url         = {http://atomiq.org/archives/2006/12/taxonomy_of_tagging_systems.html},
   biburl      = {https://puma.uni-kassel.de/url/6cd94c3f98998681aee6a5569ee81bf9/hotho},
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@electronic{loc.alize.us,
   title       = {loc.alize.us - Explore your world through everyone's eyes}, 
   url         = {http://loc.alize.us/},
   biburl      = {https://puma.uni-kassel.de/url/a9edcf1cba316922a61a8b7df8b8dbfa/hotho},
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@electronic{www.bibsonomy.org,
   title       = {BibSonomy::home}, 
   url         = {http://www.bibsonomy.org/},
   biburl      = {https://puma.uni-kassel.de/url/d1bb7b3f6cafafa7b418f9f356ff2e83/hotho},
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@electronic{www.2collab.com,
   title       = {Home - 2collab}, 
   url         = {http://www.2collab.com/home},
   biburl      = {https://puma.uni-kassel.de/url/5ef5d81f0acf9b1647a26f5fb81306d7/hotho},
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@electronic{www.ikoru.net,
   title       = {Ikoru}, 
   url         = {http://www.ikoru.net/ikoru/+/photo},
   biburl      = {https://puma.uni-kassel.de/url/6a50515409ed3d5f98996f167c5e638b/stumme},
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@electronic{www.bibsonomy.org,
   title       = {BibSonomy}, 
   url         = {http://www.bibsonomy.org},
   biburl      = {https://puma.uni-kassel.de/url/ccd37171f107576d4cd3785311fa0b87/hotho},
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@electronic{reader2.com,
   title       = {Reader² - find new books to read, put your reading list online}, 
   url         = {http://reader2.com/},
   biburl      = {https://puma.uni-kassel.de/url/5d94bafe43cc1b4cdec3ff1e733fa7e7/hotho},
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