@electronic{www.howpollutedismyroad.org.uk,
   title       = {How polluted is my road?}, 
   url         = {http://www.howpollutedismyroad.org.uk/},
   biburl      = {https://puma.uni-kassel.de/url/7e6f5a25b19406071e2ab578b12ecad7/stumme},
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@electronic{www.computational-logic.org,
   title       = {ICCL}, 
   url         = {http://www.computational-logic.org/content/events/iccl-ss-2006/},
   biburl      = {https://puma.uni-kassel.de/url/fd9d27fe95c6f82a26faad2fdf1df614/stumme},
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