@article{Hyndman2013,
author = {Hyndman, R.J. and Booth, H. and Yasmeen, F.Y.},
title= {Coherent mortality forecasting: The product-ratio method with functional time series models},
year = {2013},
doi = {10.1007/s13524-012-0145-5},
volume = {50},
number = {1},
pages = {261--283},
}