The webapp provides for each item the link on ECB's website.
Speeches for : Lucas Papademos, Jean-Claude Trichet where "essence" appeared
2009-09-03 : Introductory statement with Q&A2006-05-04 : Introductory statement with Q&A
2005-04-07 : Introductory statement with Q&A
2004-12-02 : Introductory statement with Q&A