@article{Bobak1999,
author = {Bobak, M. and Leon, D.A.},
title= {Pregnancy outcomes and outdoor air pollution: An ecological study in districts of the Czech Republic 1986-8},
year = {1999},
doi = {10.1136/oem.56.8.539},
journal = {British Medical Journal},
volume = {56},
number = {8},
pages = {539--543},
}