The webapp provides for each item the link on ECB's website.
Speeches for : Yves Mersch where "concept" appeared
2019-02-04 : The changing role of central banking2018-09-06 : Financial stability and the ECB
2016-12-06 : Distributed Ledger Technology: role and relevance of the ECB
2016-02-04 : Policy needs, knowns and unknowns in the aftermath of the crisis
2015-11-16 : “A currency beyond the nation state: The euro and its institutional challenges ahead”