The webapp provides for each item the link on ECB's website.
Speeches for : Yves Mersch where "supranational" appeared
2020-10-08 : European economic governance: early lessons from the crisis2015-04-24 : Dinner speech at EUI-NOMICS
2013-11-18 : On the road to a banking union: the way forward from the ECB's perspective
2013-11-15 : The overhaul of the architecture of the euro area and the return of investor confidence