Bibliography

The print references are given first. Complementary Web pages are provided with the reference. References that exist only online are given in a separate section.On-line references can become outdated very fast. By the time of printing, a few references might already have changed. If you can’t find information under the given address, you might try to find the new address or further information by using the popular search tools Yahoo! (http://www.yahoo.com/), Google (http://www.google.com/), or Altavista (http://www.altavista.com/).