In their Working Paper, which has also been published as Kiel Policy Brief 79, Wieland and Wolters show that there is no need for fear of a self-reinforcing deflation.
The IMFS Working Paper No. 81:
Is there a threat of self-reinforcing deflation in the Euro area? A view through the lens of the Phillips curve
("Keine Deflation in Sicht", "Wirtschaftswoche")