@electronic{www.hiermail.com,
   title       = {HierMail}, 
   url         = {http://www.hiermail.com/},
   biburl      = {https://puma.uni-kassel.de/url/84294634db3956b2e9651ac584281c75/stumme},
   keywords    = {analysis cem concept conceptual email fca formal mailsleuth manager},
   added-at    = {2007-10-10T15:35:47.000+0200},
   description = {},
   interhash   = {84294634db3956b2e9651ac584281c75}, 
   intrahash   = {84294634db3956b2e9651ac584281c75}
}

@electronic{www.mail-sleuth.com,
   title       = {Mail-Sleuth homepage}, 
   url         = {http://www.mail-sleuth.com/},
   biburl      = {https://puma.uni-kassel.de/url/a2da60c2824efd3fc7ffb7377cc7ca59/stumme},
   keywords    = {analysis cem concept conceptual email fca formal mailsleuth manager},
   added-at    = {2007-10-10T15:35:07.000+0200},
   description = {},
   interhash   = {a2da60c2824efd3fc7ffb7377cc7ca59}, 
   intrahash   = {a2da60c2824efd3fc7ffb7377cc7ca59}
}