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@electronic{www.firstentrant.com,
   title       = {FirstEntrant.com}, 
   url         = {http://www.firstentrant.com/},
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@electronic{www.bibsonomy.org,
   title       = {BibSonomy::home}, 
   url         = {http://www.bibsonomy.org/},
   biburl      = {https://puma.uni-kassel.de/url/d1bb7b3f6cafafa7b418f9f356ff2e83/stumme},
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