@inbook{Simpson1993,
author = {Simpson, J.L. and Carson, S.},
title= {Biological causes of foetal loss},
year = {1993},
editor = {Gray, R.H., Leridon, H., and Spira, A.},
booktitle = {Biomedical and Demographic Determinants of Reproduction},
address = {Oxford, England},
publisher = {Clarendon Press},
pages = {287--315},
}