The webapp provides for each item the link on ECB's website.
Speeches for : Lorenzo Bini Smaghi where "bubbles" appeared
2010-02-10 : Reserve accumulation: the other side of the coin2009-11-19 : Monetary policy in challenging times
2009-10-14 : Monetary policy and asset prices
2008-04-04 : Financial stability and monetary policy: Challenges in the current turmoil