@article{Johnson2015,
author = {Johnson, K.M. and Winkler, R.L.},
title= {Migration signatures across the decades: Net migration by age in U.S. counties, 1950–2010},
year = {2015},
doi = {10.4054/DemRes.2015.32.38},
volume = {32},
number = {38},
pages = {1065--1080},
}