@TechReport{CEPII:2017-10,
author={Federico Belotti and Edoardo Di Porto and Gianluca Santoni},
title={Spatial Differencing: Estimation and Inference},
year=2017,
month=June,
institution={CEPII},
type={Working Papers},
url={http://www.cepii.fr/CEPII/en/publications/wp/abstract.asp?NoDoc=10303},
number={2017-10},
}