The webapp provides for each item the link on ECB's website.
Speeches for : Peter Praet where "intervention" appeared
2017-07-04 : Unconventional monetary policy and fixed income markets2017-03-29 : Have unconventional policies overstretched central bank independence? Challenges for accountability and transparency in the wake of the crisis
2016-08-31 : Financial cycles and monetary policy
2014-12-19 : Is the ECB doing enough?
2014-10-10 : Recent monetary policy measures supporting the euro area recovery