The webapp provides for each item the link on ECB's website.
Speeches for : Mario Draghi where "frontier" appeared
2017-08-25 : Sustaining openness in a dynamic global economy2017-03-13 : Moving to the Frontier: Promoting the Diffusion of Innovation
2016-11-30 : The productivity challenge for Europe
2016-06-09 : On the importance of policy alignment to fulfil our economic potential