@article{Caswell2011,
author = {Caswell, H.},
title= {Beyond $R_0$: Demographic models for variability of lifetime reproductive output: Demographic models for variability of lifetime reproductive output},
year = {2011},
doi = {10.1371/journal.pone.0020809},
journal = {PLOS ONE},
volume = {6},
number = {6},
pages = {e20809},
}