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   title       = {Drawings of the Mathematics Genealogy Project graphs}, 
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@electronic{www.swivel.com,
   title       = {Tasty Data Goodies - Swivel}, 
   url         = {http://www.swivel.com/},
   biburl      = {https://puma.uni-kassel.de/url/772e1b02797c53ac034a28b8bc958362/hotho},
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