@electronic{www.crossref.org,
   title       = {crossref.org}, 
   url         = {http://www.crossref.org/},
   biburl      = {https://puma.uni-kassel.de/url/e7e76a2552420885e1b7fa4899603ebf/stephandoerfel},
   keywords    = {bibliography citation crossref doi reference research search},
   added-at    = {2011-08-04T14:19:50.000+0200},
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}