The webapp provides for each item the link on ECB's website.
Speeches for : Otmar Issing where "historical" appeared
2006-03-16 : Dinner speech. Monetary policy: a journey from theory to practice - an ECB colloquium held in honour of Otmar Issing2003-11-03 : Monetary policy in uncharted territory
2000-02-08 : European integration at the beginning of the new millennium
1999-09-20 : Europe: common money - political union?