@article{Lerchl1993,
author = {Lerchl, A. and Simoni, M. and Nieschlag, E.},
title= {Changes in seasonality of birth rates in Germany from 1951 to 1990},
year = {1993},
doi = {10.1007/BF01140808},
volume = {80},
number = {11},
pages = {516--518},
}