@techreport{Barbi2003,
author = {Barbi, E.},
title= {Assessing the rate of ageing of the human population},
year = {2003},
doi = {10.4054/MPIDR-WP-2003-008},
publisher = {Max Planck Institute for Demographic Research},
address = {Rostock},
institution = {MPIDR Working Paper WP-2003-008},
}