The webapp provides for each item the link on ECB's website.
Speeches for : Yves Mersch where "prosperity" appeared
2017-02-10 : Behaving responsibly in a low interest rate environment: A central banker's perspective2016-09-03 : Introductory remarks for the discussion panel ‘The Future of the Euro'
2015-01-25 : Advancing Monetary Union
2014-05-15 : EU integration and the road to the euro area