Over the years, the author has tried to do extensive research on many scientific areas which you can see by reading these web pages.
Many people have used results from the author's web site at no cost and have linked to his pages in blogs, usenet forums, university forums and personal pages, which you can see by looking at the author's Links section.
All the author's products except for papers for which the copyright has been transferred to the corresponding journals have been free.
The author's web site has been a free, high quality scientific resource for over ten years.
To date, since 1999, many individual, organization, institution, university or any other medium has used these pages, and many universities have used and keep using pages from this web site for their classes.
If you are scientifically inclined in any way or have found these pages useful, you can still make a donation securely via the PayPal donation button, below. A donation of 12 Euro guarantees that the web site's life will be extended some.