@article{Bongaarts2004,
author = {Bongaarts, J.},
title= {Population aging and the rising cost of public pensions},
year = {2004},
doi = {10.1111/j.1728-4457.2004.00001.x},
journal = {Population and Development Review},
volume = {30},
number = {1},
pages = {1--23},
}