@electronic{snafca.free.fr,
   title       = {ICFCA 07 Workshop - Social Network Analysis and Conceptual Structures: Exploring Opportunities}, 
   url         = {http://snafca.free.fr/},
   biburl      = {https://puma.uni-kassel.de/url/12df46e855796dd8222d51ecaba4b044/hotho},
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@electronic{conexp.sourceforge.net,
   title       = {The Concept Explorer}, 
   url         = {http://conexp.sourceforge.net/},
   biburl      = {https://puma.uni-kassel.de/url/e56582a30361e23ac1ea7a195d6cdad0/hotho},
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@electronic{toscanaj.sourceforge.net,
   title       = {ToscanaJ: Welcome}, 
   url         = {http://toscanaj.sourceforge.net/},
   biburl      = {https://puma.uni-kassel.de/url/029cf6e94d6e30e487e5958253a4d22a/hotho},
   keywords    = {fca software tools},
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