@electronic{www.freefullpdf.com,
   title       = {FreeFullPDF.com}, 
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@electronic{science.eccellio.com,
   title       = {ECCELLIO Science :: Excellent faceting search}, 
   url         = {http://science.eccellio.com/},
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@electronic{de.scientificcommons.org,
   title       = {Scientific Commons | A Community for Scientific Information}, 
   url         = {http://de.scientificcommons.org/},
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@electronic{liinwww.ira.uka.de,
   title       = {The Collection of Computer Science Bibliographies}, 
   url         = {http://liinwww.ira.uka.de/bibliography/},
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@electronic{mekentosj.com,
   title       = {mekentosj.com | Introducing Papers... Your personal library of science}, 
   url         = {http://mekentosj.com/papers/},
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   description = {Do you have dozens of PDF files from your favorite scientific articles scattered on your harddrive? Do you also try to desperately organize them by renaming and archiving them in folders? But like the piles of printed articles on your desk, you can't keep up with all the new papers you download, and despite all your efforts it has become impossible to find that one article.},
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@electronic{www.scirus.com,
   title       = {Scirus - for scientific information}, 
   url         = {http://www.scirus.com/},
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@electronic{www.sciencedirect.com,
   title       = {ScienceDirect - Home}, 
   url         = {http://www.sciencedirect.com/},
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@electronic{arxiv.org,
   title       = {arXiv.org e-Print archive}, 
   url         = {http://arxiv.org/},
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@electronic{scholar.google.com,
   title       = {Google Scholar}, 
   url         = {http://scholar.google.com/},
   biburl      = {https://puma.uni-kassel.de/url/73e6a584915eadf390fda8f5a78352b8/hotho},
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