@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},
   keywords    = {analysis association clustering folksonomy rules tag toread},
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@electronic{blog.pietrosperoni.it,
   title       = {P. S. : » Tagclouds and cultural changes}, 
   url         = {http://blog.pietrosperoni.it/2005/05/28/tagclouds-and-cultural-changes/},
   biburl      = {https://puma.uni-kassel.de/url/be57c31c97eac525ff873a8070f0131a/hotho},
   keywords    = {tagcould del.icio.us tag analysis cloud},
   added-at    = {2006-03-12T19:39:59.000+0100},
   description = {Tagclouds and cultural changes},
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