http://books.google.com/books?vid=ISBN3920405412
553
http://books.google.com/books?vid=ISBN0887282245
12
http://citation.dbpedia.org/hash2/7f0af170b79a3eb17e3fe779a2840ca1fdd1b6878d06e10083d40dd9faf2a846
11
CiteRank - project for automatic evaluation of the sources in Wikipedia articles.