@electronic{www.swivel.com,
   title       = {Tasty Data Goodies - Swivel}, 
   url         = {http://www.swivel.com/},
   biburl      = {https://puma.uni-kassel.de/url/772e1b02797c53ac034a28b8bc958362/hotho},
   keywords    = {2.0 analysis data graphs statistics visualization web},
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@electronic{www.iccs-06.hum.aau.dk,
   title       = {ICCS 2006 Aalborg - Denmark}, 
   url         = {http://www.iccs-06.hum.aau.dk/},
   biburl      = {https://puma.uni-kassel.de/url/9d83abf083a63f497e4225597ed79a02/stumme},
   keywords    = {formal graphs iccs concept analysis fca cgs conceptual cg},
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