Nov 29 2012 Tomohiko Konno   How links are formed according to the distance in transaction network of 800,000 firms   Abstract  Contact Information  Citation  Full Text  -  Note   May 28 2009 Vêlayoudom Marimoutou , Denis Peguin and Anne Peguin-Feissolle   The "distance-varying" gravity model in international economics: is the distance an obstacle to trade?   Abstract  Contact Information  Citation  Full Text  -  Note   Dec 12 2008 Michele Fratianni and Francesco Marchionne   HETEROGENEITY IN TRADE COSTS   Abstract  Contact Information  Citation  Full Text  -  Note