The webapp provides for each item the link on ECB's website.
Speeches for : Willem F. Duisenberg where "membership" appeared
2001-11-23 : The ECB and the accession process2001-01-24 : Speech at the Parliamentary Assembly of the Council of Europe
2000-09-17 : The euro as a catalyst for legal convergence in Europe
2000-03-02 : Introductory statement with Q&A
1999-10-15 : EU enlargement, some views from the ECB