The webapp provides for each item the link on ECB's website.
Speeches for : Jurgen Stark where "flexibility" appeared
2011-10-12 : Economic adjustment in a monetary union2011-05-18 : In the aftermath of the global economic crisis: What next?
2008-02-13 : The adoption of the euro: principles, procedures and criteria
2006-10-13 : The euro area's role in the global economy