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   title       = {ToscanaJ | Free Development software downloads at SourceForge.net}, 
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   title       = {Literaturliste Formale Begriffsanalyse}, 
   url         = {http://www.upriss.org.uk/fca/cache1.html},
   biburl      = {https://puma.uni-kassel.de/url/29040e858844455fac5ddf59f0106933/stumme},
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