The webapp provides for each item the link on ECB's website.
Speeches for : Willem F. Duisenberg where "formal" appeared
1998-06-09 : ECB Press conference: Introductory statement1997-10-17 : 1999 - A new European monetary system
Speeches for : Willem F. Duisenberg where "formal" appeared
1998-06-09 : ECB Press conference: Introductory statement