The webapp provides for each item the link on ECB's website.
Speeches for : Yves Mersch where "responsibility" appeared
2020-10-08 : European economic governance: early lessons from the crisis2018-09-06 : Financial stability and the ECB
2018-02-08 : Interview with Bloomberg
2014-05-14 : Keynote speech
2013-06-17 : The European Central Bank's role in overcoming the Crisis