The webapp provides for each item the link on ECB's website.
Speeches for : Jean-Claude Trichet where "severe" appeared
2011-05-15 : Contribution to Bild am Sonntag2010-05-31 : The ECB's response to the recent tensions in financial markets
2010-05-31 : Central bank cooperation after the global financial crisis
2010-05-15 : Interview with Der Spiegel