Bibliography problem

Hello,

I have a multi-part document with chapters as separate files. I've put
the bib file within a separate lyx file. When i run lyx to get the
output under linux, my bibliography doesn't appear. But under a windows
installation it does.

All my file paths for images etc within lyx are relative and they show
up okay. In both cases lyx (ver 1.3.3) can see the bib file when i'm
inserting citations.

This is the directory structure that i have got.

[Top]
        |->thesis.lyx {Include Chapter1 > Chaptern}
        |->preamble.tex
        |->refs.bib
        [chapter1]
                |->chapter1.lyx
        .
        .
        .
        [chaptern]
                |->chaptern.lyx
        [References]
                |->ref.lyx {Inserted bibtex reference here(../refs.bib)}
        [Images]
                [chapter1]
                
                .
                .
                .
                [chaptern]

Thanks
Isa