Notes, Comments and Preliminary results Apr 10 2007 Carl Gaigné and Stéphane Riou   Technical change and agglomeration   Abstract  Contact Information  Citation  Full Text  -  Note   Aug 01 2006 Carl Gaigne and Kristian Behrens   Density (dis)economies in transportation: revisiting the core-periphery model   Abstract  Contact Information  Citation  Full Text  -  Note