@inbook{De Beer2007,
author = {De Beer, J. and Van der Gaag, N. and Willekens, F.},
title= {A tool for projecting age patterns based on a standard age schedule and assumptions about relative risks using linear splines: TOPALS},
year = {2007},
booktitle = {Eurostat, Work session on demographic projections; Bucharest, 10-12 October 2007. Methodologies and working papers; 2007 edition},
pages = {211--235},
}