MathEduc online access
The database can be accessed via the server of the EMS (European Mathematical Society) at http://www.zentralblatt-math.org/matheduc/. New users are offered a trial search in the demo database, while an IP authentification is required for regular access.

ZDM
Zentralblatt Didaktik der Mathematik / The International Journal on Mathematics Education
The former analyses section of the MathEduc print version and the later electronic journal is now available as an international independent journal published by Springer.
Older articles of ZDM are available via the ELIBM