The webapp provides for each item the link on ECB's website.
Speeches for : Willem F. Duisenberg where "surprise" appeared
2000-10-05 : Introductory statement with Q&A2000-01-05 : Introductory statement with Q&A
1999-11-04 : Introductory statement with Q&A
1999-05-20 : Speech at the 11th Frankfurt International Banking Evening