@article{Šípek2001,
author = {Šípek, A. and Gregor, V. and Horáček, J. and Chudobová, M.},
title= {Down syndrome in the Czech Republic during 1961-1997: Prevalence, prenatal diagnosis and maternal-age-specific rates},
year = {2001},
journal = {Journal of Obstetrics & Gynaecology},
volume = {21},
number = {3},
pages = {266--269},
}