The webapp provides for each item the link on ECB's website.
Speeches for : Yves Mersch where "april" appeared
2018-04-27 : Reflections on monetary policy in the euro area2017-07-25 : The ECB’s monetary policy stance
2016-06-14 : Grasping the new normal of the banking industry - a view from a European Central Banker
2014-05-19 : Euro banknotes - a means of payment recognised worldwide