@electronic{total-impact.org,
   title       = {total-Impact}, 
   url         = {http://total-impact.org/},
   biburl      = {https://puma.uni-kassel.de/url/2d6bf502d610eaa99db37fada1957a95/hotho},
   keywords    = {analysis bewertung citation factors impact research},
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@electronic{www.danah.org,
   title       = {Research on Social Network Sites}, 
   url         = {http://www.danah.org/SNSResearch.html},
   biburl      = {https://puma.uni-kassel.de/url/acbadc02b9c86f716cab7e3354a80553/stumme},
   keywords    = {analysis community network research seminar sna social web2.0},
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