@article{Sobotka2011,
author = {Sobotka, T. and Lutz, W.},
title= {Misleading policy messages derived from the period TFR: Should we stop using it?},
year = {2011},
doi = {10.4232/10.cpos-2010-15en},
volume = {35},
number = {3},
pages = {637--664},
}