The webapp provides for each item the link on ECB's website.
Speeches for : Jurgen Stark where "adoption" appeared
2009-06-05 : Introduction for Session III “Economies of Central and Eastern Europe and the euro” during the National Bank of Poland Conference2008-11-14 : Closing address at the Fifth ECB Central Banking Conference
2008-02-13 : The adoption of the euro: principles, procedures and criteria
2006-11-20 : Economic and monetary challenges of euro area enlargement