@electronic{vlado.fmf.uni-lj.si,
   title       = {Software Three Dimensional Blockmodeling}, 
   url         = {http://vlado.fmf.uni-lj.si/pub/networks/progs/R/ibm3m.zip},
   biburl      = {https://puma.uni-kassel.de/url/d41353e207386cb48e126b8fe047895a/stumme},
   keywords    = {blockmodeling clustering mode software three},
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@electronic{three-mode.leidenuniv.nl,
   title       = {The Three-Mode Company Home Page}, 
   url         = {http://three-mode.leidenuniv.nl/},
   biburl      = {https://puma.uni-kassel.de/url/e5c2456a50f241d855e9fc51fa7d1dce/stumme},
   keywords    = {folksonomies data mode three analysis leiden},
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@electronic{www.childandfamilystudies.leidenuniv.nl,
   title       = {CV:Kroonenberg}, 
   url         = {http://www.childandfamilystudies.leidenuniv.nl/index.php3?c=145},
   biburl      = {https://puma.uni-kassel.de/url/d6dc62073470b8f8ce857ef411b084c3/stumme},
   keywords    = {data mode three kroonenberg leiden},
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