The webapp provides for each item the link on ECB's website.
Speeches for : Jean-Claude Trichet where "theoretical" appeared
2008-11-14 : International interdependencies and monetary policy - a policy maker's view2006-11-10 : Panel Intervention at the 4th ECB Central Banking Conference on “The role of money: Money and monetary policy in the 21st century”
2005-11-10 : Growth potential, labour productivity and structural reforms in Europe