The webapp provides for each item the link on ECB's website.
Speeches for : Lucas Papademos, Jean-Claude Trichet where "chi" appeared
2008-07-03 : Introductory statement with Q&A2008-03-06 : Introductory statement with Q&A
2005-09-01 : Introductory statement with Q&A
2004-11-04 : Introductory statement with Q&A