The webapp provides for each item the link on ECB's website.
Speeches for : Yves Mersch where "circulation" appeared
2019-09-02 : Money and private currencies: reflections on Libra2018-02-08 : Virtual or virtueless? The evolution of money in the digital age
2014-05-19 : Euro banknotes - a means of payment recognised worldwide
2014-01-13 : Unveiling the new €10 banknote