1. Amazon home page,
http://www.amazon.com
2. Brin, S., Page, L.: Google search engine,
http://google.stanford.edu
3. Brin, S.: List of books,
http://www-db.stanford.edu/sergey/booklist.html
4. Clark, D.: Disbanded. Benjamin Press, 69 Hillcrest Drive, Bath Ba2 1HD, UK,
http://www.bath.ac.uk/exxdgdc/poetry/library/di1.html
5. Deerwester, S., Dumais, S., Furnas, G., Landauer, T., Harshman, R.: Indexing by latent semantic analysis. Journal of the American Society for Information Science 41(6), 391–407 (1990)