The webapp provides for each item the link on ECB's website.
Speeches for : Vitor Constancio where "hole" appeared
2017-09-25 : Developing models for policy analysis in central banks2017-09-12 : Role and effects of the ECB non-standard policy measures
2016-11-04 : Challenges for future monetary policy frameworks: A European perspective
2013-09-24 : 2012 BernĂ¡cer prize award ceremony in honour of Nicholas Bloom