The webapp provides for each item the link on ECB's website.
Speeches for : Peter Praet where "margins" appeared
2017-03-16 : The ECB's monetary policy: past and present2016-10-06 : Monetary policy transmission in the euro area
2016-04-29 : Interview with Expansión
2015-09-09 : The ECB's asset purchase programme: the impact so far
2015-02-05 : Interview with Les Echos