@electronic{www.askspree.de,
   title       = {SPREE community}, 
   url         = {http://www.askspree.de/login},
   biburl      = {https://puma.uni-kassel.de/url/56892f919f2dbf3bc31717ca31b5aafa/hotho},
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@electronic{pajek.imfm.si,
   title       = {start [Pajek Wiki]}, 
   url         = {http://pajek.imfm.si/doku.php},
   biburl      = {https://puma.uni-kassel.de/url/c6fea0434d32f7c2d024e923836276fc/hotho},
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@electronic{kathrin.dagstuhl.de,
   title       = {Schloss Dagstuhl - Talks + Materials of Seminar 08391}, 
   url         = {http://kathrin.dagstuhl.de/08391/Materials2/},
   biburl      = {https://puma.uni-kassel.de/url/9977ce2abd20957a61850a2b3e64b64f/hotho},
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