@electronic{www.dandelon.com,
   title       = {Dandelon}, 
   url         = {http://www.dandelon.com/intelligentSEARCH.nsf},
   biburl      = {https://puma.uni-kassel.de/url/d70cc29d28990171e5e98749e697fa3f/hotho},
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@electronic{www.oldenbourg-wissenschaftsverlag.de,
   title       = {Oldenbourg Wissenschaftsverlag: Web 2.0 in der Unternehmenspraxis}, 
   url         = {http://www.oldenbourg-wissenschaftsverlag.de/olb/de/1.c.1330715.de?hasjs=1201701448&submittedByForm=1&_reiter=buch&_lang=de&gsid=1.c.325875.de&id=1327007},
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@electronic{www.uni-bamberg.de,
   title       = {Otto-Friedrich-Universität Bamberg: IR1-Buch}, 
   url         = {http://www.uni-bamberg.de/minf/IR1-Buch},
   biburl      = {https://puma.uni-kassel.de/url/1078c520daf1c63930b1d28f7027f0e4/hotho},
   keywords    = {buch information ir lecture material retrieval vorlesung},
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@electronic{www.libreka.de,
   title       = {libreka!}, 
   url         = {http://www.libreka.de/BookStore/pagedisplay.do?pub=bor},
   biburl      = {https://puma.uni-kassel.de/url/da935db83c780876ca8f95f8f6e77561/hotho},
   keywords    = {buch bücher pdf suche volltext},
   added-at    = {2007-10-14T19:01:20.000+0200},
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@electronic{vlb-public.bvdep.com,
   title       = {buchhandel.de}, 
   url         = {http://vlb-public.bvdep.com/?caller=vlbPublic&strFrame=titelsuche},
   biburl      = {https://puma.uni-kassel.de/url/95c7c1507e7904132f0f038328b2141e/hotho},
   keywords    = {buch bücher deutschland isbn suche},
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}