The webapp provides for each item the link on ECB's website.
Speeches for : Peter Praet where "authority" appeared
2015-03-11 : Public sector security purchases and monetary dominance in a monetary union without a fiscal union2012-10-10 : The role of money in a market economy
2012-02-27 : Sound money, sound finances, a competitive economy - principles of a european culture of stability
2011-11-10 : The (changing) role of central banks in financial stability policies