@electronic{www.l3s.de,
   title       = {Forschungszentrum L3S - Publikationen}, 
   url         = {http://www.l3s.de/php/publikation.php},
   biburl      = {https://puma.uni-kassel.de/url/210ac776e15d5c9e313320792b465c2a/stumme},
   keywords    = {l3s center research publications},
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@electronic{www.l3s.de,
   title       = {L3S Research Center - staff}, 
   url         = {http://www.l3s.de/english/people/L3S_staff.html},
   biburl      = {https://puma.uni-kassel.de/url/240739535d4ca6347a73af80d070a7ed/stumme},
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@electronic{www.l3s.de,
   title       = {L3S Research Center - project overview}, 
   url         = {http://www.l3s.de/english/projects/projects_overview.html},
   biburl      = {https://puma.uni-kassel.de/url/41fe79d5c535ab74abd11c2d571f90d1/stumme},
   keywords    = {list projects l3s overview project research},
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