The webapp provides for each item the link on ECB's website.
Speeches for : Lucas Papademos where "theory" appeared
2007-05-02 : Economic performance, institutions, and human values2006-11-10 : The role of money in the conduct of monetary policy
2003-11-03 : Growth and stability in Europe: the role of monetary policy
2003-04-11 : Policy challenges of euro area enlargement
2003-03-07 : Economic Cycles and Monetary Policy