|Copyright for all material on the site
is of Christian Lehmann, Universität Erfurt. Anyone may use, but not multiply, this material under condition of mention of the name of the copyright owner and this site (example of quotation).
|Apart from theory and methodology, these pages also contain many facts and data, some with, some without indication of the source. I will be grateful for any corrections, and I hereby express my sincere thanks to those people – too many to be enumerated here – who have helped me improve this site.|
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