@electronic{socialmedia.typepad.com,
   title       = {Social Media Research Blog: Clustering Tags and Links Simultaneously}, 
   url         = {http://socialmedia.typepad.com/blog/2008/04/clustering-tags.html},
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@electronic{www2008.org,
   title       = {WWW2008 Refereed Papers - WWW 2008: Refereed Papers}, 
   url         = {http://www2008.org/papers/fp648.html},
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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},
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@electronic{www.rashmisinha.com,
   title       = {Tag Sorting: Another tool in an information architect's toolbox}, 
   url         = {http://www.rashmisinha.com/archives/05_02/tag-sorting.html},
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   title       = {Clustering comes to Flickr}, 
   url         = {http://www.rashmisinha.com/archives/05_08/flickr-clusters.html},
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@electronic{www.kde.cs.uni-kassel.de,
   title       = {Andreas Hotho, KDE Group, University of Kassel}, 
   url         = {http://www.kde.cs.uni-kassel.de/hotho/publicationBibSonomy.html},
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@electronic{www.citeulike.org,
   title       = {CiteULike: Tag clustering}, 
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