The webapp provides for each item the link on ECB's website.
Speeches for : Lucas Papademos where "principle" appeared
2009-05-07 : Introductory statement with Q&A2008-11-13 : Opening address at the Fifth ECB Central Banking Conference
2007-09-21 : The science of monetary policy: past advances and future challenges
2005-11-03 : Introductory statement with Q&A
2005-03-31 : Interview with Corriere della Sera