The webapp provides for each item the link on ECB's website.
Speeches for : Willem F. Duisenberg where "constitution" appeared
2003-10-22 : Maastricht and the future of Europe2003-06-16 : The first lustrum of the ECB
2003-05-08 : Introductory statement with Q&A
2002-05-09 : International Charlemagne Prize of Aachen for 2002
2002-05-08 : What are the political consequences of the euro?