I'm looking for a document (probably a scholarly paper or article from
a business journal) that thoroughly compares the data quality of
various vendors of historical fundimental data for international
stocks.  (like Compustat, WorldScope, and bloomberg for instance.)  I
found one such document via scholar.google.  Its at
http://sfb649.wiwi.hu-berlin.de/papers/pdf/SFB649DP2005-064.pdf.  This
is a good start but it only covers U.S. companies.  I'd like to find
articles like this that cover the foreign stocks as well.  I do NOT
want a simple list of data vendors with brief descriptions.  (That's
easy to find.)  I want an article (or articles) that thoroughly
COMPARES different vendors and gives me an idea of which one offers
superior data.