@electronic{www.gutenberg.org,
   title       = {Dewey Decimal Classification}, 
   url         = {http://www.gutenberg.org/files/12513/12513-h/12513-h.htm},
   biburl      = {https://puma.uni-kassel.de/url/f6e581275ef3948b0be1fdacd5727cd2/hotho},
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@electronic{www.knowledgesearch.org,
   title       = {The Semantic Indexing Project}, 
   url         = {http://www.knowledgesearch.org/},
   biburl      = {https://puma.uni-kassel.de/url/b41c4ee4905c7fd4ce9b3e3904a12e99/hotho},
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