@article{Tuljapurkar2011,
author = {Tuljapurkar, S. and Edwards, R.D.},
title= {Variance in death and its implications for modeling and forecasting mortality},
year = {2011},
doi = {10.4054/DemRes.2011.24.21},
volume = {24},
number = {21},
pages = {497--526},
}