@electronic{www.fring.com,
   title       = {fring – Free mobile calls, and chat with mobile Skype, mobile MSN Messenger, mobile icq, Twitter, AIM® & Yahoo!™ and more}, 
   url         = {http://www.fring.com/fring_is/what_is_fring/},
   biburl      = {https://puma.uni-kassel.de/url/136d214f9d6db607dc10ee97d5767149/hotho},
   keywords    = {application icq im messaging mobile s60 skype},
   added-at    = {2008-09-12T14:57:02.000+0200},
   description = {},
   interhash   = {136d214f9d6db607dc10ee97d5767149}, 
   intrahash   = {136d214f9d6db607dc10ee97d5767149}
}

@electronic{gizmo5.com,
   title       = {Gizmo5 - Make free internet calls from your mobile phone and computer - Home}, 
   url         = {http://gizmo5.com/pc/},
   biburl      = {https://puma.uni-kassel.de/url/12595741046436f01e3e24a3d3121f73/hotho},
   keywords    = {calls gizmo im messages mobile s60 skype},
   added-at    = {2008-09-10T10:52:40.000+0200},
   description = {},
   interhash   = {12595741046436f01e3e24a3d3121f73}, 
   intrahash   = {12595741046436f01e3e24a3d3121f73}
}