Central and Eastern European Online Library CEEOL
CEEOL https://www.ceeol.com/ is a leading provider of academic e-journals and e-books in the Humanities and Social Sciences from and about Central and Eastern Europe.
Thank you for your suggestion! It appears that CEEOL supports only a very limited search capability and not a full openurl resolver (or even an ability to lookup an article by DOI). It also appears many of the publishers included in it are quite small and would not meet our metadata requirements even if CEEOL itself was supported.
We will note the interest and check back in the future to see if the situation has changed.