The webapp provides for each item the link on ECB's website.
Speeches for : Willem F. Duisenberg where "prominent" appeared
2000-11-10 : The euro and the single monetary policy2000-05-30 : From the EMI to the ECB
1999-11-19 : Introductory Statement at the Frankfurt European Banking Congress, Session I: Do markets need guidance?
1999-09-10 : Speech at the Swiss Banking Congress in Zurich
1998-11-10 : The ESCB's stability-oriented monetary policy strategy