In part from a previous version of the Wikipedia page [1] on the Voynich Manuscript

Developed a theory that it is a Manchu-language (Wikipedia page [2]) document written in plaintext.

The Polish Press Agency featured an article on the topic in October 2003.

More information here [3] (last updated 2004) and there is an extensive discussion here [4].

His page on the Polish Wikipedia is [5]