The webapp provides for each item the link on ECB's website.
Speeches for : Sabine Lautenschlager where "aggregate" appeared
2018-07-10 : 20 years of ESCB statistics: Past achievements and future challenges2018-01-29 : Basel III - sense and sensitivity
2016-07-05 : Central bank statistics: moving beyond the aggregates
2015-10-20 : Highlights of European Statistics by the ESCB - present and future