@article{Wisborg1996,
author = {Wisborg, K. and Henriksen, T.B. and Hedegaard, M. and Jergen, N.},
title= {Smoking during pregnancy and preterm birth},
year = {1996},
doi = {10.1111/j.1471-0528.1996.tb09877.x},
volume = {103},
number = {8},
pages = {800--805},
}