The webapp provides for each item the link on ECB's website.
Speeches for : Willem F. Duisenberg where "colla" appeared
2003-06-12 : Key issues for the ECB in the field of payment systems2002-10-24 : Second ECB Central Banking Conference 24-25 October 2002, Frankfurt am Main
2000-11-02 : First ECB Central Banking Conference, 2-3 November 2000, Frankfurt am Main