@article{Porter2002,
author = {Porter, G.},
title= {Living in a walking world: Rural mobility and social equity issues in sub-Saharan Africa},
year = {2002},
doi = {10.1016/S0305-750X(01)00106-1},
journal = {World Development},
volume = {30},
number = {2},
pages = {285--300},
}