@article{Haberman2012,
author = {Haberman, S. and Renshaw, A.E.},
title= {Parametric mortality improvement rate modelling and projecting},
year = {2012},
doi = {10.1016/j.insmatheco.2011.11.005},
journal = {Insurance: Mathematics and Economics },
volume = {50},
pages = {309--333},
}