Thanks guys for your help.

It turned out to be an encoding problem: BibTex does not support unicode 
yet.

Cheers,
Sebastian

rgheck wrote:
> On 07/13/2009 10:22 AM, Sebastian Stolzenberg wrote:
>> Hi rh, Hi Murat, Hi All,
>>
>> let's define $tmp=/tmp/lyx_tmpdir.TJ6542/lyx_tmpbuf2
>>
>> There is 1 reference in the test.bib I attached, but looking into the 
>> $tmp/test.log file, I get this error message here:
>>
>> LaTeX Warning: Empty `thebibliography' environment on input line 3.
>>
>> since $tmp/test.bbl has no references. However, there exists 
>> $tmp/0_home_sebastian_test.bib, including my 1 reference.
>>
>> The files test.aux, test.tex, and test.tex.dep-pdf (all in $tmp) 
>> refer to this bib file.
>>
>> @rh: As a workaround, did you add a reference to a *.bib or a *.bbl 
>> file to make things work? If *.bbl, could you kindly send me the 
>> *.bbl file so that I can learn, how to these references manually?
>>
> No, I didn't do anything but add a footnote to your LyX file. Without 
> it, of course there will be no references, since nothing is cited. 
> Normally, LyX (and, for that matter, LaTeX) includes only cited 
> material in the bibliography. This allows you to have a single, huge 
> bib file that you use with all your documents, and only the ones you 
> cite get output.
>
> If you want to output everything in the bib file, then click on the 
> bibliography inset and then, at the bottom, where it says "Content", 
> choose "All references".
>
> rh
>