@article{Schoen2002,
author = {Schoen, R.},
title= {On the impact of spatial momentum},
year = {2002},
doi = {10.4054/DemRes.2002.6.3},
URL = {http://www.demographic-research.org/Volumes/Vol6/3/},
journal = {Demographic Research},
volume = {6},
number = {3},
pages = {49--66},
}