Herzer, Dierk; Kemper, Niels and Zamparelli, Luca (2009): Balanced growth and structural breaks: Evidence for Germany. Unpublished.
Iacono, Roberto (2005): La variazione dei prezzi relativi da Ricardo a Sraffa. Unpublished.
zamparelli, luca (2008): Direction and intensity of technical change: a micro-founded growth model. Unpublished.