@article{Lutz2009,
author = {Lutz, W. },
title= {The demography of future global population aging: Indicators, uncertainty, and educational composition},
year = {2009},
doi = {10.1111/j.1728-4457.2009.00282.x},
journal = {Population Development Review },
volume = {35},
number = {2},
pages = {357--368},
}