The webapp provides for each item the link on ECB's website.
Speeches for : Willem F. Duisenberg where "effectiveness" appeared
2001-10-16 : The ECB's quantitative definition of price stability and its comparison with such definitions or inflation targets applied in other large economic areas1998-02-16 : The ESCB: independent, transparent and communicative
1997-11-20 : Monetary policy in EMU
1997-11-15 : Monetary policy in EMU