@article{Koupilová1998,
author = {Koupilová, I. and Bobák, M. and Holčík, J. and Pikhart, H. and Leon, D.A.},
title= {Increasing social variation in birth outcomes in the Czech Republic after 1989},
year = {1998},
doi = {10.2105/AJPH.88.9.1343},
journal = {American Journal of Public Health},
volume = {88},
number = {9},
pages = {1343--1347},
}