@electronic{networkchallenge.darpa.mil,
   title       = {Network Challenge}, 
   url         = {https://networkchallenge.darpa.mil/},
   biburl      = {https://puma.uni-kassel.de/url/60066d97d9c81b009c9f02218e50cfda/stumme},
   keywords    = {DARPA balloon contest open red},
   added-at    = {2009-12-07T12:38:40.000+0100},
   description = {},
   interhash   = {60066d97d9c81b009c9f02218e50cfda}, 
   intrahash   = {60066d97d9c81b009c9f02218e50cfda}
}

@electronic{www.openredballoon.com,
   title       = {The Open Red Balloon Project}, 
   url         = {http://www.openredballoon.com/},
   biburl      = {https://puma.uni-kassel.de/url/7e8ddc669a25a5be2980567b3666d471/stumme},
   keywords    = {DARPA balloon contest open red},
   added-at    = {2009-12-07T12:37:44.000+0100},
   description = {},
   interhash   = {7e8ddc669a25a5be2980567b3666d471}, 
   intrahash   = {7e8ddc669a25a5be2980567b3666d471}
}