The webapp provides for each item the link on ECB's website.
Speeches for : Jean-Claude Trichet where "estimates" appeared
2007-09-26 : The monetary policy implications of ageing2007-08-27 : Productivity in the euro area and monetary policy
2007-04-12 : Introductory statement with Q&A
2005-08-27 : Monetary Policy and 'Credible Alertness'