@article{Engelman2014,
author = {Engelman, M. and Caswell, H. and Agree, E.M.},
title= {Why do lifespan variability trends for the young and old diverge? A perturbation analysis},
year = {2014},
doi = {10.4054/DemRes.2014.30.48},
journal = {Demographic Research },
volume = {30},
number = {48},
pages = {1367--1396},
}