@article{Ravallion1991,
author = {Ravallion, M. and Van De Walle, D.},
title= {Urban–rural cost-of-living differentials in a developing economy},
year = {1991},
doi = {10.1016/0094-1190(91)90030-B},
volume = {29},
number = {1},
pages = {113--127},
}