helpful

Starting from this side a pair aid and/or compositions are callable, which does not directly with the actual representation topics, but nevertheless a working with this Internet appearance to facilitate are.

Sitemap and guide help to find with an overview or references the looked for information.

While under basic ideas preparing considerations are listed, under chronology annually diary is written over the current work to the homepage.

Under literature all sources of all four languages are specified. In contrast to it on the appropriate sides of the topics only in each case the topic-referred sources of the respective language one lists.

Under links are specified references, which do not fit the three main topics, but can from interest to be nevertheless.