@electronic{speakingjs.com,
   title       = {Speaking JavaScript}, 
   url         = {http://speakingjs.com/es5/},
   biburl      = {https://puma.uni-kassel.de/url/ddbde2ea12df05ad467ac9f68875f349/stephandoerfel},
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@electronic{docstore.mik.ua,
   title       = {O'Reilly's CD bookshelf}, 
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   biburl      = {https://puma.uni-kassel.de/url/b87ad57a47ff6ae0974acb1bdd0fed75/stephandoerfel},
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@electronic{www.unix.org.ua,
   title       = {The Perl CD Bookshelf}, 
   url         = {http://www.unix.org.ua/orelly/perl/},
   biburl      = {https://puma.uni-kassel.de/url/830a637a75802eebea6be76e52a3b1c2/hotho},
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@electronic{www.fyslab.hut.fi,
   title       = {Sergey Dorogovtsev}, 
   url         = {http://www.fyslab.hut.fi/~sdo/},
   biburl      = {https://puma.uni-kassel.de/url/ab2817fb6eb1a7ad0b4a7b99b288c717/hotho},
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@electronic{www.cse.ucsd.edu,
   title       = {Book}, 
   url         = {http://www.cse.ucsd.edu/users/dasgupta/mcgrawhill/},
   biburl      = {https://puma.uni-kassel.de/url/a26559878779be8ba0acd632c52471c3/stumme},
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@electronic{www.cse.ucsd.edu,
   title       = {Book}, 
   url         = {http://www.cse.ucsd.edu/users/dasgupta/mcgrawhill/},
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