@article{Delwarde2007,
author = {Delwarde, Antoine and Denuit, Michel and Eilers, Paul H. C.},
title= {Smoothing the Lee–Carter and Poisson log-bilinear models for mortality forecasting: A penalized log-likelihood approach},
year = {2007},
doi = {10.1177/1471082X0600700103},
volume = {7},
pages = {29--48},
}