The webapp provides for each item the link on ECB's website.
Speeches for : Yves Mersch where "difficulties" appeared
2018-11-22 : Europe: a work in progress – political integration and economic convergence in Monetary Union2016-02-04 : Policy needs, knowns and unknowns in the aftermath of the crisis
2014-05-14 : Keynote speech at 70th Banking Conference of German Cooperative Banks