Much of this article was translated from the German version of February 2007.

Translated and revised from the Japanese version by the authors.

This article was translated from the version in Polish wikipedia.

Both Chinese versions were translated from the Russian version.

The following plot summary is translated from the Japanese version:

History (translated from the German version of this article)

(The following is translated from the German version of this page.)

This article has been translated from the original French version.

Substantial parts of this article were translated from the version on the Polish wikipedia.

Translated from the French version of this page.