The webapp provides for each item the link on ECB's website.
Speeches for : Lorenzo Bini Smaghi where "differential" appeared
2008-10-28 : Growth and inflation in the euro area: the importance of productivity in the services sector2007-11-20 : Real and nominal convergence: policy challenges
2007-06-19 : Asymmetric Adjustment in Monetary Unions:Evidence from the Euro Area