1. Ir Merkatz, Hm Nitowsky, Jn Macri, We Johnson, An association between low maternal serum alpha-fetoprotein (AFP) and fetal chromosomal abnormalities, Am J Obstet Gynecol ((in press)).
2. Antenatal screening in Oxford for fetal neural-tube defects;Wald;Br J Obstet Gynaecol,1979
3. Effect of estimating gestational age by ultrasound cephalometry on the specificity of alpha-fetoprotein screening for open neural tube defects;Wald;Br J Obstet Gynaecol,1982
4. Estimated rates of Down syndrome in livebirths by one year maternal age intervals in a New York State study. Implications of the risk figures for genetic counselling and cost-benefit analysis of prenatal diagnosis programs;Hook,1977
5. Birth Statistics, England and Wales, 1980;Office of population Censuses and Surveys,1981