@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{blog.namics.com,
   title       = {Folksonomies_Cooperative_Classification.pdf (application/pdf-Objekt)}, 
   url         = {http://blog.namics.com/2005/Folksonomies_Cooperative_Classification.pdf},
   biburl      = {https://puma.uni-kassel.de/url/0fcfe9fdf6d7654958063c527a94b057/stumme},
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@electronic{www.43things.com,
   title       = {43 Things}, 
   url         = {http://www.43things.com/},
   biburl      = {https://puma.uni-kassel.de/url/291de7f15127f2c9bc7850fc37e9ee27/stumme},
   keywords    = {folksonomy tool},
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@electronic{www.citeulike.org,
   title       = {CiteULike: A free online service to organise your academic papers}, 
   url         = {http://www.citeulike.org/},
   biburl      = {https://puma.uni-kassel.de/url/0fad32c2267808963fe4f6e976b3f396/stumme},
   keywords    = {folksonomy tool},
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@electronic{flickr.com,
   title       = {Welcome to Flickr - Photo Sharing}, 
   url         = {http://flickr.com/},
   biburl      = {https://puma.uni-kassel.de/url/8b98271bc005bfc60cc8f5d2554366df/stumme},
   keywords    = {folksonomy tool},
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