@article{Lutz2008,
author = {Lutz, W. and Sanderson, W.C. and Scherbov, S.},
title= {The coming acceleration of global population ageing},
year = {2008},
doi = {10.1038/nature06516},
journal = {Nature},
volume = {451},
number = {7179},
pages = {716--719},
}