Established in 2003. Discountinued in 2014, when the editor-in-chief + lot of
editorial board resigned in protest against the transformation of the journal
into a "gold open access" one. De Gruyter claims the journal is continued as
Open Mathematics, and on their site,
retroactively presents papers published in CEJM as published in
Open Mathematics. The proper successor seems to be
European Journal of Mathematics.
as of Nov 14 2015]