The webapp provides for each item the link on ECB's website.
Speeches for : Jurgen Stark where "circumstance" appeared
2010-11-16 : The new normal2008-11-14 : Closing address at the Fifth ECB Central Banking Conference
2008-03-28 : Speech delivered at the Conference 'Monetary Policy in Sub Saharan Africa: Practice and Promise'
2007-01-19 : Objectives and challenges of monetary policy: a view from the ECB