This is one of the articles I published during
more than thirty years in several media. The articles available on my website
are meant to present you with a representative and varied selection from my
œuvre, neither more nor less. It is not impossible that the information contained
in this article is superseded or incorrect.
So the author cannot accept any responsiblility for the use the reader makes of the information provided by this article.
Though the articles on my website have been made available to the public, they are copyrighted. Partial or total reproduction is only permitted with written consent by the author and in many cases also by the publisher of the periodical the article concerned was published in.