Title: "http://dbpedia.org/resource/Planet_Simpson"

http://books.google.com/books?vid=ISBN978-0-679-31318-2

http://books.google.com/books?vid=ISBN978-0-306-81448-8

http://books.google.com/books?vid=ISBN978-0-306-81341-2

http://books.google.com/books?vid=ISBN030681448X

http://books.google.com/books?vid=ISBN978-0-09-190336-7

http://books.google.com/books?vid=ISBN978-0-09-189756-7

CiteRank

CiteRank - project for automatic evaluation of the sources in Wikipedia articles.