The webapp provides for each item the link on ECB's website.
Speeches for : Otmar Issing where "credible" appeared
2005-06-09 : The Lisbon process - a view from the ECB2005-04-27 : The enlargement of the EU and the euro zone
2004-10-22 : EU enlargement and monetary integration
2001-06-18 : Monetary policy and financial markets
2000-10-26 : Should we have faith in central banks?