The webapp provides for each item the link on ECB's website.
Speeches for : Willem F. Duisenberg where "guideline" 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 areas1998-12-08 : Hearing at the European Parliament's Committee on Economic and Monetary Affairs and Industrial Policy on 8 December 1998 in Brussels