@article{Li2009,
author = {Li, J.S.H. and Hardy, M.R. and Tan, K.S.},
title= {Uncertainty in mortality forecasting: An extension to the classical Lee–Carter approach},
year = {2009},
doi = {10.2143/AST.39.1.2038060},
volume = {39},
number = {1},
pages = {137--164},
}