@TechReport{CEPII:2003-02,
author={Pierre-Philippe Combes and Miren Lafourcade and Thierry Mayer},
title={Can Business and Social Networks Explain the Border Effect Puzzle?},
year=2003,
month=January,
institution={CEPII},
type={Working Papers},
url={http://www.cepii.fr/CEPII/fr/publications/wp/abstract.asp?NoDoc=162},
number={2003-02},
}