http://www.acm.org/sigmod/dblp/db/indices/a-tree/n/Norvig:Peter.html http://www.informatik.uni-trier.de/~ley/db/indices/a-tree/n/Norvig:Peter.html http://sunsite.informatik.rwth-aachen.de/dblp/db/indices/a-tree/n/Norvig:Peter.html http://sunsite.ust.hk/dblp/db/indices/a-tree/n/Norvig:Peter.html http://www.informatik.uni-trier.de/~ley/addr.html