The webapp provides for each item the link on ECB's website.
Speeches for : Benoit Coure where "influence" appeared
2017-05-16 : Dissecting the yield curve: a central bank perspective2015-05-19 : How binding is the zero lower bound?
2015-01-13 : Interview with Die Welt
2013-09-26 : The usefulness of forward guidance
2012-03-26 : The monetary policy of the European Central Bank