Note for pdf files

When some of us or our results appear in the media or in a scientific journal, after a while, the article is often made available as an Adobe Acrobat pdf in this NEWS section. However, the copyrights to these articles are held by their publishers. The pdf files provided here may be used only for single copies for personal use, as though they were reprints provided by mail. They may not be reposted on other web sites or used for any other purpose without the explicit permission of the appropriate publisher.