The webapp provides for each item the link on ECB's website.
Speeches for : Willem F. Duisenberg where "colleague" appeared
2003-10-29 : Address delivered on the occasion of a special ECOFIN dinner to pay tribute to his leadership of the European Central Bank2002-10-24 : Second ECB Central Banking Conference 24-25 October 2002, Frankfurt am Main
2002-07-05 : International Research Forum on Monetary Policy
2002-04-04 : Introductory statement with Q&A
2000-05-11 : Introductory statement with Q&A
1999-05-20 : Speech at the 11th Frankfurt International Banking Evening