The webapp provides for each item the link on ECB's website.
Speeches for : Otmar Issing where "federal" appeared
2004-09-29 : Kommunikation, Transparenz, Rechenschaft - Geldpolitik im 21. Jahrhundert (incl. link to EN version)2004-05-12 : The ECB and the euro - the first five years
2001-10-17 : The challenge for monetary policy: a European perspective