@article{Preston2007,
author = {Preston, S. and Wang, H.},
title= {Intrinsic growth rates and net reproduction rates in the presence of migration},
year = {2007},
doi = {10.1111/j.1728-4457.2007.00192.x},
journal = {Population and Development Review},
volume = {33},
number = {4},
pages = {657--666},
}