The webapp provides for each item the link on ECB's website.
Speeches for : Otmar Issing where "liberal" appeared
2002-12-05 : Why stable prices and stable markets are important and how they fit together2001-06-28 : Liberaler Kapitalismus und Soziale Marktwirtschaft
2000-01-10 : Opening Remarks at a Hearing of the Committee on Economic and Monetary Affairs of the European Parliament