citations and references in multi document files

[Micha Feigin]

I just split my thesis into multiple documents as it became impossible to
handle after the 80 page mark without folding (which AFAIK lyx doesn't 
support).

Anyway, this works find except for references and citations. references to
other parts of the document have to be entered manually and I can only 
push
citations from bibtex as they are not known to the local document and even 
then
I can't control their format.

Is there any solution to any of these problems?

Thanks