The webapp provides for each item the link on ECB's website.
Speeches for : Willem F. Duisenberg where "night" appeared
2002-10-08 : The integration of Europe's financial markets2002-07-05 : International Research Forum on Monetary Policy
1999-05-20 : Speech at the 11th Frankfurt International Banking Evening
1998-07-08 : ECB Press conference: Introductory statement