http://books.google.com/books?vid=ISBN0-214-20512-6
621
http://books.google.com/books?vid=ISBN0-214-20480-4
8
http://books.google.com/books?vid=ISBN978-0-214-20512-5
5
http://books.google.com/books?vid=ISBN9780214204807
1
CiteRank
CiteRank - project for automatic evaluation of the sources in Wikipedia articles.