@electronic{www.kobv.de,
   title       = {KOBV : Opus & Archivierung}, 
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   title       = {Konrad Zuse testet PUMA}, 
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@electronic{www.zib.de,
   title       = {Zuse-Institut Berlin: Susanne Gottwald}, 
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@electronic{www.susigottwald.de,
   title       = {Susanne Gottwald}, 
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@electronic{www.opus-bayern.de,
   title       = {Online-Publikationsserver (OPUS) - Universität Würzburg}, 
   url         = {http://www.opus-bayern.de/uni-wuerzburg/},
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