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   title       = {Taxonomies and Tags}, 
   url         = {http://www.hyperorg.com/blogger/misc/taxonomies_and_tags.html},
   biburl      = {https://puma.uni-kassel.de/url/5a8d34f0c0f396d465ad31a8f0e8f2b0/hotho},
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@electronic{help.sap.com,
   title       = {SAP-Bibliothek - Knowledge Management}, 
   url         = {http://help.sap.com/saphelp_erp2004/helpdata/de/54/9d953fc405330ee10000000a114084/frameset.htm},
   biburl      = {https://puma.uni-kassel.de/url/feeb66840f1e9fecb12903a1cbc30ed8/hotho},
   keywords    = {SAP query_basierte Taxonomie},
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