The webapp provides for each item the link on ECB's website.
Speeches for : Vitor Constancio where "slack" appeared
2017-10-15 : Growth in a more resilient Euro area2017-09-22 : Understanding and overcoming low inflation
2017-06-28 : Interview with CNBC
2015-11-05 : Understanding Inflation Dynamics and Monetary Policy in a Low Inflation Environment
2015-08-29 : Understanding Inflation Dynamics and Monetary Policy
2014-10-16 : Maintaining price stability in the euro area