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   title       = {Goethe-Universität — Information}, 
   url         = {http://www2.uni-frankfurt.de/39329549/Information},
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@electronic{blog.bibsonomy.org,
   title       = {BibSonomy Blog: PUMA in use in Frankfurt}, 
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@electronic{www.frankfurt-airport.de,
   title       = {Lageplan Flughafen Frankfurt}, 
   url         = {http://www.frankfurt-airport.de/cms/default/dokbin/357/357832.uebersicht.pdf},
   biburl      = {https://puma.uni-kassel.de/url/100c2e0cf2afd4576070fac432c8942d/benz},
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@electronic{www.frankfurt-airport.de,
   title       = {Frankfurt Airport | Lagepläne}, 
   url         = {http://www.frankfurt-airport.de/cms/default/rubrik/26/26413.lageplaene.html},
   biburl      = {https://puma.uni-kassel.de/url/8745cdfef1292af0f2fb06d6b01cc251/benz},
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