@electronic{www.uderzo.it,
   title       = {SpaceSniffer, find lost disk space the easy way.}, 
   url         = {http://www.uderzo.it/main_products/space_sniffer/index.html},
   biburl      = {https://puma.uni-kassel.de/url/da8eb3f3d36568ecdb84744c529880b9/benz},
   keywords    = {analyze disk festplatte free hard_disk hd space tool usage windows},
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   description = {SpaceSniffer is a freeWare (donations are welcomed) and portable tool application that lets you understand how folders and files are structured on your disks. By using a Treemap visualization layout, you have immediate perception of where big folders and files are situated on your devices. },
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@electronic{jroller.com,
   title       = {Home | Eric's Agile Answers}, 
   url         = {http://jroller.com/agileanswers/date/20060623},
   biburl      = {https://puma.uni-kassel.de/url/04e7b7fdc53be399cf881246816a147e/hotho},
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@electronic{www.vectorsjournal.org,
   title       = {Vectors Journal of Culture and Technology in a Dynamic Vernacular}, 
   url         = {http://www.vectorsjournal.org/},
   biburl      = {https://puma.uni-kassel.de/url/64880ab32954a029ebb8f99bd83bf601/stumme},
   keywords    = {journal keywords space tags vectors},
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@electronic{sec.noaa.gov,
   title       = {Today's Space Weather}, 
   url         = {http://sec.noaa.gov/today.html},
   biburl      = {https://puma.uni-kassel.de/url/16ed8468432f898c3d2b0ad6709b7b08/hotho},
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@electronic{www.eng.cam.ac.uk,
   title       = {Cambridge University Engineering Department - Squeezing Space in LaTeX}, 
   url         = {http://www.eng.cam.ac.uk/help/tpl/textprocessing/squeeze.html},
   biburl      = {https://puma.uni-kassel.de/url/c650c2f0f06e2325f1b48806c8686131/stumme},
   keywords    = {squeezing squeeze LaTeX space in},
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