@article{Sobotka2005,
author = {Sobotka, T. and Winkler-Dworak, M. and M.R.Testa and Lutz, W. and Philipov, D. and Engelhardt, H. and Gisser, R.},
title= {Monthly Estimates of the Quantum of Fertility: Towards a Fertility Monitoring System in Austria},
year = {2005},
journal = {Vienna Yearbook of Population Research},
volume = {2005},
pages = {109--141},
}