@electronic{www.wordle.net,
   title       = {Wordle - Beautiful Word Clouds}, 
   url         = {http://www.wordle.net/},
   biburl      = {https://puma.uni-kassel.de/url/b80861332728aa4d235cd4ad1ccf3d80/hotho},
   keywords    = {cloud generator tag wordel wordle},
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@electronic{www.socialsignal.com,
   title       = {The tag cloud is dead. Long live the tag cloud. | Social Signal}, 
   url         = {http://www.socialsignal.com/image/the-tag-cloud-is-dead-long-live-the-tag-cloud},
   biburl      = {https://puma.uni-kassel.de/url/d4e937e9e8072d6f80a5e1de71c71601/hotho},
   keywords    = {art artwork bild cloud dead fun live social tag},
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@electronic{www.tagcrowd.com,
   title       = {TagCrowd - make your own tag cloud from any text}, 
   url         = {http://www.tagcrowd.com/},
   biburl      = {https://puma.uni-kassel.de/url/1f7ab08c76d0da64db908791ce138439/hotho},
   keywords    = {cloud generator tag},
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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},
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