Terms of use

All materials published on this site are only for private and educational use

The copyright always belongs to the original authors.
Re-publishing is allowed unless otherwise is stated explicitly (pages are marked as "Copyright").
In all cases of content re-publishing the informative reference to the original source (or related page on this site) shall be provided along with the re-published content. In cases the content of this site has been used for other works or has just been useful, referencing of our site will be appreciated.
In cases where a page is marked explicitly as "Copyright" the copying is not allowed without explicit site administration permission, the page content shall be considered as copyright protected.

In case of doubts or copyright protected pages:

please contact the site administration for further clarification using the site feedback form.