The webapp provides for each item the link on ECB's website.
Speeches for : Sabine Lautenschlager where "maintain" appeared
2019-04-01 : Interview with Der Standard2018-12-30 : Interview with Deutschlandfunk
2018-10-12 : Guardians of stability – Central Banks, supervisors and the quest for financial stability
2014-11-29 : How innovative should central banks be?