Disclaimer:

The Author (Josef Jobst) makes every effort to ensure, but does not guarantee, the accuracy of the information on his web site.
Links (Hyperlinks) to other web sites imply neither responsibility for, nor approval of, the information contained in those other web sites on the part of the Author.

Copyright
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This information may be freely used and copied for educational and other non-commercial purposes, provided that any reproduction of data be accompanied by an acknowledgement of the Author as the source ( © Josef Jobst ).
 
This does not apply to the pages and images with explicitly reserved reproduction right:
© followed by the right owner and the year of first circulation. Reproduction of the latter requires prior authorization from the author.