The webapp provides for each item the link on ECB's website.
Speeches for : Yves Mersch where "functions" appeared
2019-02-04 : The changing role of central banking2017-03-30 : Central bank independence revisited
2016-04-25 : Distributed ledger technology - panacea or flash in the pan?
2013-09-06 : Monetary policy and financial stability under one roof