The webapp provides for each item the link on ECB's website.
Speeches for : Mario Draghi where "argument" appeared
2016-04-28 : Interview with Bild2016-02-04 : How central banks meet the challenge of low inflation
2014-09-11 : Keynote speech at the Eurofi Financial Forum
2014-04-24 : Monetary policy communication in turbulent times
2013-10-09 : Europe's pursuit of ‘a more perfect Union'