Is it possible to define a single and unique path by default when one use ox-bibtex? 

I meet the following problem. At the end of  an org file, in order to use ox-bibtex to get bibliographical references , I have this line:

#+BIBLIOGRAPHY: references plain option:-a limit:t

It means that I need to have the file references.bib in the same folder of this paper.org's . I have tried to write to give the path of the default folder of my references.bib: 

 #+BIBLIOGRAPHY: ~/Dropbox/Bibliographiers/references plain option:-a limit:t

but  in this case biblatex2html fails. 

It means that I have to copy the references.bib from folder to folder and I do not like this solution. 

I do not doubt that there is a better solution, but I do not see it. 

Your help is welcome,

Best wishes,

Jo.