The webapp provides for each item the link on ECB's website.
Speeches for : Benoit Coure where "riskfree" appeared
2019-02-26 : Euro interest rate benchmark reform: achievements and remaining challenges2018-09-25 : Waiting for ESTER: the road ahead for interest rate benchmark reform
2018-02-26 : The importance of euro interest rate benchmark reforms
2017-05-16 : Dissecting the yield curve: a central bank perspective