The webapp provides for each item the link on ECB's website.
Speeches for : Eugenio Domingo Solans where "maastricht" appeared
2002-11-22 : Some thoughts on the performance of the ECB2002-01-24 : The culmination of European Monetary Union
2000-09-12 : Parameters of the eurosystem's monetary policy
1998-12-04 : The monetary policy of the European Central Bank