The webapp provides for each item the link on ECB's website.
Speeches for : Mario Draghi where "denomination" appeared
2017-08-23 : The interdependence of research and policymaking2015-02-24 : Unveiling of the new €20 banknote
2014-03-03 : Hearing at the Committee on Economic and Monetary Affairs of the European Parliament
2013-05-06 : The euro, monetary policy and reforms